<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONDENSED CONSOLIDATED BALANCE SHEETS AT SEPTEMBER 30, 1999 AND 1998 (UNAUDITED)
AND THE CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND CASH FLOWS FOR THE
NINE MONTHS ENDED SEPTEMBER 30, 1999 AND 1998 (UNAUDITED) AND IS QUALIFIED IN
ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>

                             
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-END>                               SEP-30-1999
<CASH>                                      10,025,544
<SECURITIES>                                         0
<RECEIVABLES>                                8,051,932
<ALLOWANCES>                                   184,365
<INVENTORY>                                  3,705,804
<CURRENT-ASSETS>                            23,009,534
<PP&E>                                      17,244,701
<DEPRECIATION>                               9,140,508
<TOTAL-ASSETS>                              47,287,727
<CURRENT-LIABILITIES>                        7,006,993
<BONDS>                                              0
<PREFERRED-MANDATORY>                           35,499
<PREFERRED>                                          0
<COMMON>                                             0
<OTHER-SE>                                  38,213,411
<TOTAL-LIABILITY-AND-EQUITY>                47,287,727
<SALES>                                     52,391,491
<TOTAL-REVENUES>                            52,391,491
<CGS>                                       30,383,702
<TOTAL-COSTS>                               22,007,789
<OTHER-EXPENSES>                                43,154
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                           (204,073)
<INCOME-PRETAX>                              6,546,624
<INCOME-TAX>                                 2,618,650
<INCOME-CONTINUING>                          3,927,974
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                 3,927,974
<EPS-BASIC>                                       1.11
<EPS-DILUTED>                                     1.10