EXHIBIT 10.9
                                SURETY AGREEMENT

To:      Commerce Bank, N.A.                                     March 20, 2002
         1701 Route 70 East
         Cherry Hill, NJ 08034

     To induce you to establish and/or continue financing  arrangements with and
consider  making or  continuing  certain  loans and  extending or  continuing to
extend credit from time to time to BLONDER TONGUE LABORATORIES, INC., a Delaware
corporation,  (the "Borrower"), the Undersigned,  intending to be legally bound,
hereby  guarantees and becomes surety for the  unconditional  and prompt payment
and  performance  to  you of all of the  Obligations  (as  defined  in the  Loan
Agreement,  as defined below) of Borrower to you. The Undersigned shall also pay
or reimburse  you on demand for all  reasonable  costs and  expenses,  including
without limitation, reasonable attorneys' fees and costs, incurred by you at any
time to enforce,  protect,  preserve,  or defend your rights  hereunder and with
respect to any property securing this Surety Agreement.  All payments  hereunder
shall be made in lawful money of the United  States,  in  immediately  available
funds.  Unless otherwise  defined herein,  all capitalized  terms shall have the
respective  meanings  given to such  terms  in that  certain  Loan and  Security
Agreement,  of even date herewith, by and between Borrower and you (as it may be
supplemented,  restated,  superseded, amended or replaced from time to time, the
"Loan Agreement").

     The Undersigned further undertakes and agrees as follows:

     1. The Undersigned represents and warrants that:

          (a)  The  Undersigned's  execution  and  performance  of  this  Surety
Agreement shall not (i) violate or result in a default or breach (immediately or
with the passage of time) under any material  contract,  agreement or instrument
to which the Undersigned is a party or by which the  Undersigned is bound,  (ii)
violate or result in a default or breach  under any  applicable  order,  decree,
award,  injunction,  judgment, law, regulation or rule, (iii) cause or result in
the  imposition  or creation of any lien upon any  property of the  Undersigned,
other than liens in favor of you, or (iv) violate the Undersigned's  Certificate
of  Incorporation,   By-Laws  or  any  other  organizational   document  of  the
Undersigned.

          (b) The  Undersigned  has full corporate  power and authority to enter
into and  perform  under  this  Surety  Agreement  and to incur the  obligations
provided for herein.  The  execution,  delivery and  performance  of this Surety
Agreement has been authorized by all proper and necessary  corporate  actions of
the Undersigned.

          (c) No  consent,  license or  approval  of, or filing or  registration
with, any Governmental  Authority is necessary for the execution and performance
hereof by the  Undersigned,  except (a) such as have been duly  obtained or made
prior to the date  hereof and (b) such that the  failure to obtain or make would
not have a material adverse effect on the Undersigned's financial condition.

          (d) This Surety Agreement constitutes the valid and binding obligation
of  the  Undersigned   enforceable  in  accordance  with  its  terms  except  as
enforceability   may  be   limited   by



applicable bankruptcy, insolvency,  reorganization,  moratorium and similar laws
affecting the enforcement of creditors'  rights generally and general  equitable
principles.

          (e) This Surety  Agreement  promotes  and  furthers  the  business and
interests of the Undersigned,  and the incurrence of the Obligations by Borrower
and creation of the  obligations  hereunder will result in financial  benefit to
the Undersigned.

     2. The  Undersigned  hereby  waives all notices with respect to this Surety
Agreement,  including  without  limitation,  notices of (a)  acceptance  of this
Surety  Agreement,  (b) the  existence  or  incurring  from  time to time of any
Obligations guaranteed hereunder, (c) the existence of any Event of Default, the
making of demand,  or the taking of any action by you, under the Loan Agreement,
and (d) demand and default hereunder.

     3. The  Undersigned  hereby consents and agrees that you may at any time or
from time to time in your  discretion  (a) extend or change the time of payment,
and/or the  manner,  place or terms of payment  of any or all  Obligations,  (b)
amend,  supplement or replace the Loan Agreement or any related agreements,  (c)
renew, extend,  modify,  increase (without limit of any kind and whether related
or unrelated) or decrease loans and extensions of credit to Borrower, (d) modify
the terms and conditions  under which loans and extensions of credit may be made
to  Borrower,  (e) settle,  compromise  or grant  releases  for  liabilities  of
Borrower  and/or any other  person or persons  liable with  Undersigned  for any
Obligations,  (f) exchange, release, surrender, sell, subordinate, or compromise
any  collateral of any party now or hereafter  securing any of the  Obligations,
and (g) apply  any and all  payments  received  by you at any time  against  the
Obligations  in any order as you may  determine;  all of the  foregoing  in such
manner and upon such terms as you may see fit and  without  notice to or further
consent  from the  Undersigned,  who hereby  agrees to be and shall remain bound
under this Surety Agreement notwithstanding any such action(s) on your part.

     4. The liability of the Undersigned hereunder is absolute and unconditional
and shall not be  reduced,  impaired or affected in any way by reason of (a) any
failure to obtain,  retain or preserve, or the lack of prior enforcement of, any
rights against any person or persons (including,  without limitation,  Borrower,
the Undersigned, or any other obligor) or in any property, (b) the invalidity or
unenforceability  of any Obligations or rights in any Collateral,  (c) any delay
in  making  demand  upon  Borrower  (or any  other  obligor),  or any  delay  in
enforcing,  or any failure to enforce,  any rights against  Borrower,  any other
obligor or in any  Collateral  even if such  rights are  thereby  lost,  (d) any
failure,  neglect or  omission  on your part to obtain or perfect any lien upon,
protect,  exercise rights against, or realize on, any property of Borrower,  the
Undersigned  or any other party securing the  Obligations,  (e) the existence or
nonexistence  of any defenses which may be available to Borrower with respect to
the Obligations (other than the defense of payment),  (f) any failure to proceed
against Borrower or any Collateral in a commercially  reasonable  manner, or (g)
the commencement of any bankruptcy, reorganization,  liquidation, dissolution or
receivership proceeding or case filed by or against Borrower.

     5. If any or all payments made from time to time to you with respect to any
Obligation  hereby  guaranteed are recovered from, or repaid by, you in whole or
in part in any  bankruptcy,  reorganization,  insolvency  or similar  proceeding
instituted by or against  Borrower,  this Surety  Agreement shall continue to be
fully  applicable  to such  Obligation to the same extent as if the recovered or
repaid payment(s) had never been originally made on such Obligation.

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     6. All rights and  remedies  hereunder  and under the Loan  Agreement,  and
related agreements,  are cumulative and not alternative,  and you may proceed in
any order from time to time against Borrower,  the Undersigned  and/or any other
obligor of Borrower's Obligations and their respective assets.

     7. Any and all  rights of any  nature of the  Undersigned  to  subrogation,
reimbursement  or indemnity and any right of the  Undersigned to recourse to any
assets  or  property  of  Borrower  for  any  reason  shall  be  unconditionally
subordinated  to all of your rights under the Loan Agreement and the Undersigned
shall not at any time  exercise  any of such rights  unless and until all of the
Obligations have been indefeasibly paid and satisfied in full.

     8. Your books and records of any and all of Borrower's Obligations,  absent
manifest  error,  shall be prima facie evidence  against the  Undersigned of the
indebtedness due you or to become due to you hereunder.

     9. This Surety  Agreement shall constitute a continuing  surety  obligation
and you may continue to act in reliance hereon until all of the Obligations have
been  indefeasibly paid and satisfied in full. You shall not have any obligation
to proceed against, or exhaust any or all of your rights against, Borrower prior
to proceeding against the Undersigned hereunder.

     10. The  Undersigned  agrees that you shall have a right of setoff  against
any and all property of the Undersigned  now or at any time in your  possession,
including  without  limitation  deposit accounts,  and the proceeds thereof,  as
security for the obligations of the Undersigned hereunder.

     11.  If an  Event  of  Default  occurs  and is  continuing  under  the Loan
Agreement,  then all of the Undersigned's Obligations to you hereunder shall, at
your option, become immediately due and payable and you may at any time and from
time to time take any and/or all actions  and  enforce  all rights and  remedies
available  hereunder  or  under  applicable  law to  collect  the  Undersigned's
liabilities hereunder.

     12.  Failure  or delay  in  exercising  any  right or  remedy  against  the
Undersigned  hereunder  shall not be deemed a waiver  thereof  or  preclude  the
exercise of any other right or remedy  hereunder.  No waiver of any breach of or
provision  of this  Surety  Agreement  shall be  construed  as a  waiver  of any
subsequent breach or of any other provision.  The invalidity or unenforceability
of any provision  hereof shall not affect the remaining  provisions  which shall
remain in full force and effect.

     13. This Surety Agreement shall (a) be legally binding upon the Undersigned
and the  Undersigned's  successors and assigns,  provided that the Undersigned's
obligations  hereunder  may not be  delegated  or  assigned  without  your prior
written consent and (b) benefit any and all of your successors and assigns.

     14. This Surety Agreement embodies the whole agreement and understanding of
the parties hereto relative to the subject matter hereof. No modification of any
provision hereof shall be enforceable unless approved by you in writing.

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     15. This Surety  Agreement shall in all respects be interpreted,  construed
and governed in accordance with the  substantive  laws of the  jurisdiction  set
forth in Section 9.1 of the Loan  Agreement.  The  Undersigned  irrevocably  (i)
submits to jurisdiction  of the state and federal courts of the  jurisdiction as
set  forth  in  Section  9.18 of the  Loan  Agreement  for the  purposes  of any
litigation  or  proceeding  hereunder  or  concerning  the terms hereof and (ii)
WAIVES ANY AND ALL RIGHTS THE UNDERSIGNED MAY HAVE TO A JURY TRIAL IN CONNECTION
WITH ANY LITIGATION,  PROCEEDING OR COUNTERCLAIM  ARISING WITH RESPECT TO RIGHTS
AND  OBLIGATIONS  OF THE  PARTIES  HERETO  OR UNDER THE LOAN  DOCUMENTS  OR WITH
RESPECT  TO  ANY  CLAIMS  ARISING  OUT  OF  ANY  DISCUSSIONS,   NEGOTIATIONS  OR
COMMUNICATIONS   INVOLVING  OR  RELATED  TO  ANY  PROPOSED  RENEWAL   EXTENSION,
AMENDMENT,  MODIFICATION,  RESTRUCTURE,  FORBEARANCE, WORKOUT, OR ENFORCEMENT OF
THE TRANSACTIONS CONTEMPLATED BY THE LOAN DOCUMENTS.

     16. (a) In any  action or  proceeding  brought by you to enforce  the terms
hereof, the Undersigned waives personal service of the summons,  complaint,  and
any motion or other  process,  and agrees that  notice  thereof may be served by
registered  or  certified  mail,  return  receipt  requested  or  by  nationally
recognized  overnight courier at the address of the Undersigned set forth on the
signature page hereof. Such service shall be deemed made on the date of delivery
at such address.

          (b) Any and all notices which may be given to the  Undersigned  by you
hereunder shall be sent to the Undersigned at the address of the Undersigned set
forth on the signature page hereof and shall be deemed given to and received (on
the date  delivered) by the  Undersigned  if personally  delivered or if sent by
facsimile  transmission or if sent in the manner provided for service of process
in paragraph 16(a) above.

     17. So long as the Obligations are outstanding,  the Undersigned  shall not
sell,  transfer,  convey or dispose of any assets outside of the ordinary course
of business to any entity other than Borrower or any other Surety.

     IN WITNESS  WHEREOF,  the  undersigned  parties have  executed  this Surety
Agreement the day and year first above written.



                                 BLONDER TONGUE INVESTMENT COMPANY


                                 By: /s/ James A. Luksch
                                    -------------------------------------
                                    James A. Luksch, President and CEO


                                 Address:  c/o Blonder Tongue Laboratories, Inc.
                                           One Jake Brown Road
                                           Old Bridge, NJ  08857
                                           Attn:  President

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