Exhibit 21
THERMO INSTRUMENT SYSTEMS INC.
Subsidiaries of the Registrant
As of February 20, 1998, the Registrant owned the following
subsidiaries:
STATE OR
JURISDICTION PERCENT
NAME OF OF
INCORPORATION OWNERSHIP
Analytical Instrument Development, Inc. Pennsylvania 100
Eberline Instrument Company Limited United Kingdom 100
Eberline Instrument Corporation New Mexico 100
Epsilon Industrial Inc. Texas 100
ESM Eberline Instruments Strahlen Germany 100
- und Umweltmesstechnik GmbH
Fisons Instruments Vertriebs GmbH Germany 100
Gebruder Haake GmbH Germany 100
Gas Tech Inc. California 100
Gas Tech Australia, Pty. Ltd. Australia 50*
Gas Tech Partnership California 50*
Gastech Instruments Canada Ltd. Canada 100
Life Sciences International Limited United Kingdom 100
Comdate Services Limited England 100
Lipshaw Limited England 100
Luckham Limited England 100
Phicom Limited England 100
Shandon Scientific Limited England 100
Southions Investments Limited England 100
Sungel Puntar Rubber Estate Limited England 100
Westions Limited England 100
Whale Scientific Limited England 100
Helmet Securities Limited England 100
Life Sciences International GmbH Germany 100
Life Sciences International Kft Hungary 100
Life Sciences International SNC France 100
Life Sciences International France 100
(France) SA
Shandon SA France 100
Life Sciences International, Inc. Pennsylvania 100
LSI North America Service Inc. Delaware 100
Shandon, Inc. Pennsylvania 100
Alko Diagnostic Corporation Massachusetts 100
E-C Apparatus Corporation Florida 100
Whale Scientific, Inc. Colorado 100
Life Sciences International Holdings BV Netherlands 100
Biosystems Oy Finland 100
Life Sciences International Poland 100
(Poland) SP z O.O
Angela Scientific Instruments Limited England 100
Britlowes Limited England 100
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THERMO INSTRUMENT SYSTEMS INC.
Subsidiaries of the Registrant
STATE OR
JURISDICTION PERCENT
NAME OF OF
INCORPORATION OWNERSHIP
Commendstar Limited England 100
Consumer & Video Holdings Limited England 100
Video Communications Limited England 100
Greensecure Projects Limited England 100
Labsystems Europe GA Spain 100
Labsystems Ges mbH Austria 100
LSI (US) Inc. Delaware 100
Omnigene Limited England 59
Shandon Southern Instruments Limited England 100
Shenbridge Limited England 100
Southern Instruments Holdings Limited England 100
Metrika Systems Corporation Delaware 60**
Eberline Radiometrie GmbH Germany 100
Eberline Radiometrie S.A. France 100
Gamma-Metrics California 100
Gamma-Metrics International F.S.C. Inc. Guam 100
Radiometrie U.S.A., Inc. California 100
Thermo Instrument Systems Limited United Kingdom 100
National Nuclear Corporation California 100
ONIX Systems Inc. Delaware 87**
Brandt Instruments, Inc. Delaware 100
CAC Inc. Delaware 100
Flow Automation Inc. Texas 100
Thermo Instrument Controls de Mexico, Mexico 100
S.A. de C.V.
(1% of which shares are owned directly
by ONIX Systems Inc.)
VG Gas Analysis Systems Inc. Massachusetts 100
Houston Atlas Inc. Texas 100
ONIX Holdings Limited England 100
CAC Limited United Kingdom 100
Flow Automation (UK) Limited United Kingdom 100
VG Gas Analysis Limited United Kingdom 100
Peek Measurement Limited England 100
Peek Environmental Limited England 100
Sarasota Data Products Limited England 100
Sarasota Instrumentation Limited England 100
Peek Measurement, Inc. Texas 100
TN Spectrace Europe B.V. Netherlands 100
TN Technologies Inc. Texas 100
Kay-Ray/Sensall, Inc. Delaware 100
TN Technologies Canada Inc. Canada 100
Westronics Inc. Texas 100
Optek-Nicolet Holdings Inc. Wisconsin 100
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THERMO INSTRUMENT SYSTEMS INC.
Subsidiaries of the Registrant
STATE OR
JURISDICTION PERCENT
NAME OF OF
INCORPORATION OWNERSHIP
Thermo Optek Corporation Delaware 91**
(additionally, 1.47% of the shares are
owned directly by The Thermo Electron
Companies Inc.)
Spectronic Instruments, Inc. Delaware 100
SLM International Inc. Illinois 100
Thermo Jarrell Ash Corporation Massachusetts 100
ARL Applied Research Laboratories Switzerland 100
S.A.
Fisons Instruments (Proprietary) South Africa 100
Limited
Thermo Optek Wissenschaftliche Austria 100
Gerate GesmbH
Baird Do Brazil Representacoes Ltda. Brazil 100
Beijing Baird Analytical Instrument China 100
Technology Co. Limited
Cahn Instrument Corporation Wisconsin 100
Mattson Instruments Limited United Kingdom 100
Thermo Elemental Limited United Kingdom 100
Thermo Optek Limited United Kingdom 100
Unicam Limited United Kingdom 100
Unicam Export Limited United Kingdom 100
Unicam Analytical Technology Netherlands 100
Netherlands B.V.
Unicam Italia SpA Italy 100
Unicam S.A. Belgium 100
Fisons Instruments Nordic AB Sweden 100
Nicolet Instrument Corporation Wisconsin 100
Nicolet Japan K.K. Japan 100
Spectra-Tech, Inc. Wisconsin 100
Spectra-Tech, Europe Limited United Kingdom 100
Nicolet Instrument GmbH Germany 100
Optek Securities Corporation Massachusetts 100
Planweld Holding Limited United Kingdom 100
Nicolet Instrument Limited United Kingdom 100
Planweld Limited United Kingdom 100
Hilger Analytical Limited United Kingdom 100
Thermo Electron Limited United Kingdom 100
Thermo Instrument Systems Japan Delaware 100
Holdings, Inc.
Nippon Jarrell-Ash Company, Ltd. Japan 100
Thermo Instruments (Canada) Inc. Canada 100
Eberline Instruments (Canada) Ltd. Canada 100
Fisons Instruments Inc. Canada 100
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THERMO INSTRUMENT SYSTEMS INC.
Subsidiaries of the Registrant
STATE OR
JURISDICTION PERCENT
NAME OF OF
INCORPORATION OWNERSHIP
Unicam Analytical Inc. Canada 100
Thermo Optek France S.A. France 100
Thermo Optek Holding B.V. Netherlands 100
Baird Europe B.V. Netherlands 100
Baird France S.A.R.L. France 100
Thermo Group B.V. Netherlands 100
Thermo Optek Materials Analysis (S.E.A.) Singapore 100
Pte Limited
VG Systems Limited United Kingdom 100
ThermoSpectra Corporation Delaware 77**
(additionally, 6.23% of the shares are
owned directly by The Thermo Electron
Companies Inc.)
Diametrix Detectors, Inc. Delaware 50
Gould Instrument Systems, Inc. Ohio 100
Kevex Instruments Inc. Delaware 100
Kevex X-Ray Inc. Delaware 100
Neslab Instruments Europa BV Netherlands 100
Neslab Instruments, Inc. New Hampshire 100
Neslab Instruments Limited England 100
Nicolet Instrument Technologies Inc. Wisconsin 100
NORAN Instruments Inc. Wisconsin 100
Park Scientific Instruments Corporation California 100
Park Scientific S.A. Switzerland 100
PSI Virgin Islands Incorporated U.S. Virgin 100
Islands
Sierra Research and Technology, Inc. Delaware 100
ThermoSpectra B.V. Netherlands 100
Nicolet Technologies B.V. Netherlands 100
Bakker Electronics Limited United Kingdom 100
NORAN Instruments B.V. Netherlands 100
ThermoSpectra GmbH Germany 100
Gould Nicolet Messtechnik GmbH Germany 100
NORAN Instruments GmbH Germany 100
ThermoSpectra Limited United Kingdom 100
Nicolet Technologies Ltd. United Kingdom 100
Thermo Spectra S.A. France 100
Nicolet Technologies S.A.R.L. France 100
Quest-Finnigan Holdings Inc. Virginia 100
Quest-TSP Holdings Inc. Delaware 100
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THERMO INSTRUMENT SYSTEMS INC.
Subsidiaries of the Registrant
STATE OR
JURISDICTION PERCENT
NAME OF OF
INCORPORATION OWNERSHIP
ThermoQuest Corporation Delaware 88**
(43.9% of which shares are owned
directly by Quest-Finnigan Holdings
Inc.)
(additionally, .12% of the shares are
owned directly by The Thermo Electron
Companies Inc.)
Denley Instruments Limited England 100
E-C Apparatus Limited England 100
Finnigan FT/MS Inc. Delaware 100
Finnigan Corporation Delaware 100
Finnigan Instruments, Inc. New York 100
Finnigan International Sales, Inc. California 100
Finnigan MAT China, Inc. California 100
Finnigan MAT (Delaware), Inc. Delaware 100
Finnigan MAT Instruments, Inc. Nevada 100
Finnigan MAT International Sales, California 100
Inc.
Finnigan MAT (Nevada), Inc. Nevada 100
Finnigan MAT Canada, Ltd. Canada 100
Finnigan MAT GmbH Germany 100
Finnigan MAT S.R.L. Italy 100
Thermo Separation Products Italy 100
S.R.L.
Masslab Limited United Kingdom 100
Thermo Instruments Australia Pty. Australia 100
Limited
ThermoQuest Ltd. United Kingdom 100
Finnigan MAT Ltd. United Kingdom 100
Finnigan MAT AB Sweden 100
Thermo Separation Products Ltd. United Kingdom 100
Finnigan Properties, Inc. California 100
Forma Scientific, Inc. Delaware 100
Forma Ohio Inc. Ohio 100
International Equipment Company Delaware 100
International Equipment Company England 100
Limited
Savant Instruments, Inc. New York 100
Forma Scientific Limited England 100
Hypersil Inc. Delaware 100
Hypersil Limited England 100
Life Sciences International Hong Kong 100
(Hong Kong) Limited
Life Sciences International, Inc. Pennsylvania 100
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THERMO INSTRUMENT SYSTEMS INC.
Subsidiaries of the Registrant
STATE OR
JURISDICTION PERCENT
NAME OF OF
INCORPORATION OWNERSHIP
Life Sciences International England 100
(Europe) Limited
Life Sciences International England 100
(UK) Limited
Kenbury Limited England 100
Savant Instruments Limited England 100
ThermoQuest B.V. Netherlands 100
Thermo Separation Products B.V. Netherlands 100
Thermo Separation Products Belgium 100
B.V. B.A.
ThermoQuest France S.A. France 100
Finnigan Automass S.A. France 100
Finnigan MAT S.A.R.L. France 100
Thermo Separation Products S.A. France 100
ThermoQuest Italia S.p.A. Italy 100
ThermoQuest Spain S.A. Spain 100
ThermoQuest Wissenschaftliche Austria 100
Gerate GmbH
Thermo Separation Products AG Switzerland 100
Thermo Separation Products Inc. Delaware 100
ThermoQuest GmbH Germany 100
Thermo Separation Products GmbH Germany 100
ThermoQuest K.K. Japan 100
RealFlex Systems Inc. Texas 100
SID Instruments Inc. Delaware 100
FI Instruments Inc. Delaware 100
FI S.A. France 100
Fisons Instruments BV Netherlands 100
Fisons Instruments NV Belgium 100
Fisons Instruments K.K. Japan 100
HB Instruments Inc. Delaware 100
NK Instruments Inc. Delaware 100
Thermo Capillary Electrophoresis Inc. Delaware 100
Thermo Haake Ltd. United Kingdom 100
Thermo Haake (U.K.) Limited United Kingdom 100
Thermo Instrumentos Cientificos S.A. Spain 100
Spectrace Instruments Inc. California 100
PAGE 6
THERMO INSTRUMENT SYSTEMS INC.
Subsidiaries of the Registrant
STATE OR
JURISDICTION PERCENT
NAME OF OF
INCORPORATION OWNERSHIP
Thermo BioAnalysis Corporation Delaware 70**
(4.1% of which shares are owned directly by
Quest-TSP Holdings Inc. and 1.8% of
which shares are owned directly by
Quest-Finnigan Holdings Inc.
(Additionally, 7.12% of the shares are
owned directly by The Thermo
Electron Companies Inc.)
Denley Instruments Inc. North Carolina 100
Fastighets AB Skrubba Sweden 100
Dynatech Laboratories spol. s.r.o. Czech Republic 100
DYNEX Technologies (Asia) Inc. Delaware 100
DYNEX Technologies Inc. Virginia 100
Hybaid BV Netherlands 100
Hybaid Limited England 100
Labsystems Espana SA Spain 100
Labsystems Inc. Delaware 100
Labysystems Japan K.K. Japan 100
Labsystems OY Finland 100
Labsystems (Hong Kong) Limited Hong Kong 99
Labsystems BTD China 33
Labsystems LHD China 33
Labsystems Lenpipette Russia 95
Labsystems Pakistan (Private) Ltd Pakistan 34
Labsystems Sweden AB Sweden 100
Labsystems (UK) Limited England 100
Life Sciences International(Benelux) B.V. Netherlands 100
Thermo BioAnalysis GmbH Germany 100
DYNEX Technologies GmbH Germany 100
Thermo LabSystems Vertriebs GmbH Germany 100
Thermo BioAnalysis (Guernsey) Ltd. Channel 100
Islands
Thermo BioAnalysis Holding, Limited United Kingdom 100
Affinity Sensors Limited United Kingdom 100
Dynex Technologies Limited United Kingdom 100
Thermo BioAnalysis Limited United Kingdom 100
Thermo LabSystems Limited United Kingdom 100
Thermo BioAnalysis S.A. France 100
Thermo LabSystems S.A.R.L. France 100
Thermo LabSystem (Australia) Pty Limited Australia 100
Thermo LabSystems Inc. Massachusetts 100
Thermo Environmental Instruments Inc. California 100
PAGE 7
THERMO INSTRUMENT SYSTEMS INC.
Subsidiaries of the Registrant
STATE OR
JURISDICTION PERCENT
NAME OF OF
INCORPORATION OWNERSHIP
Thermo Instruments do Brasil Ltda. Brazil 100
(1% of which shares are owned directly
by Thermo Jarrell Ash Corporation)
Van Hengel Holding B.V. Netherlands 100
ESM Eberline Instruments Strahlen Germany 100
- und Umweltmesstechnik GmbH
Fisons Instruments Vertriebs GmbH Germany 100
Gebruder Haake GmbH Germany 100
Thermo Instrument Systems B.V. Netherlands 100
Euroglas B.V. Netherlands 100
Thermo Automation Services (ThAS) B.V. Netherlands 100
This Analytical B.V. Netherlands 100
This Gas Analysis B.V. Netherlands
This Lab Systems B.V. Netherlands 100
This Scientific B.V. Netherlands 100
Thermo Instruments GmbH Germany 100
Thermo Jarrell Ash, S.A. Spain 100
Thermo Vision Corporation Delaware 78**
(additionally, 1.27 % of the shares are
owned directly by The Thermo Electron
Companies Inc.)
CID Technologies Inc. New York 100
Centro Vision Inc. Delaware 100
Hilger Crystals Limited United Kingdom 100
Laser Science, Inc. Delaware 100
Oriel Instruments Corporation Delaware 100
Oriel Foreign Sales Corp. U.S. Virgin 100
Islands
* Joint Venture/Partnership ** As of 1/3/98
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