ㆍO.S.Walker Co.
ㆍOak Technical Inc.
ㆍOakton Instruments
ㆍOberon
ㆍOCA Optical Corp of America
ㆍOcean Optics Europe
ㆍOcean Optics Inc.
ㆍOceanic Disposal Management Inc.
ㆍOceanside Photo and Telescope
ㆍOCLI Optical Coating Laboratories Inc.
ㆍOctoPlus B.V.
ㆍODEXIM S.A.
ㆍOEM Concepts Inc.
ㆍOG System Inc.
ㆍOHARA Corporation
ㆍO'Hara Technologies Inc.
ㆍOhaus Corp.
ㆍOhio Valley Specialty Chemical Inc.
ㆍOhmex Ltd.
ㆍOI Analytical
ㆍOK-1 Manufacturing
ㆍOKO Technologies
ㆍOlin Corporation
ㆍOLIS: On-Line Instrument Systems Inc.
ㆍOlympus Corp.
ㆍOmega Biotek
ㆍOmega Diagnostics Ltd.
ㆍOmega Engineering Inc.
ㆍOmega Optical Inc.
ㆍOmicron Biochemicals Inc.
ㆍOmicron NanoTechnology GmbH
ㆍOMNI International Inc.
ㆍOMNI International LLC
ㆍOmni/Ajax
ㆍOmnical Inc.
ㆍOmniCal Technologies Inc.
ㆍOmnicare Pharmaceutics Inc.
ㆍOmnichrome
ㆍOmnidata International Inc.
ㆍOmnifit Ltd.
ㆍOmniglow Corp.
ㆍOmnimark Instrument Corp.
ㆍOmniScience Pharmaceuticals Inc.
ㆍOmniTek v.o.f.
ㆍOncogene Research Products
ㆍONCOGENETICS Inc.
ㆍOncor Inc.
ㆍOneida Research Services Inc.
ㆍOnguard Industries
ㆍOnLine Analytics Inc.
ㆍOnset Computer Corporation
ㆍOntario Knife Company
ㆍOntario Ovens Inc.
ㆍOnyvax Ltd.
ㆍOpcon Associates
ㆍOperon Inc.
ㆍOpti Quip Inc.
ㆍOPTICAD
ㆍOptical Activity Ltd.
ㆍOptical Coating Laboratory Inc. (OCLI)
ㆍOptical Coating Technologies Inc.
ㆍOptical Components Inc.
ㆍOptical Data Solutions Inc.
ㆍOptical Insights LLC
ㆍOptical Product Development Inc.
ㆍOptical Research Associates
ㆍOptical Solutions
ㆍOptiCell Inc.
ㆍOpticoat Associates Inc.
ㆍOptiComp Corporation
ㆍOpticon Inc.
ㆍOptics 1 Inc.
ㆍOptics.org
ㆍOptikos Corporation
ㆍOptima Inc.
ㆍOptima Machinery Corp.

ㆍOptima Precision Inc.
ㆍOptimal Control Inc.
ㆍOptimas Corp.
ㆍOptimize Technologies
ㆍOptimum Technologies Inc.
ㆍOptiscan P/L
ㆍOpti-Sciences Inc.
ㆍOptitron Inc.
ㆍOptiwave Corporation
ㆍOptomax
ㆍOptometrics LLC
ㆍOPTOVAC EM Industries
ㆍOptro-Mechanics (USA) Corp.
ㆍOptronic AB
ㆍOptronic Laboratories Inc.
ㆍOptronics Engineering
ㆍOral Pathology Laboratory Inc.
ㆍOrange Scientific
ㆍOrasure Technologies Inc.
ㆍOraVax
ㆍOrbeco Analytical Systems Inc.
ㆍOrbital Europa S.A. Centre d'Empreses
  de Noves Tecnologies
ㆍOrbital Sciences Corp.
ㆍOrca Photonic Systems Inc.
ㆍOrchid BioSciences Inc.
ㆍOread Inc.
ㆍOrganogenesis Inc.
ㆍOrganomation Associates Inc.
ㆍOrganon Inc.
ㆍOrganon Teknika N.V.
ㆍOrganon Teknika-Cappel
ㆍOrgenics Ltd.
ㆍORGENTEC Diagnostika GmbH
ㆍOrica Ltd.
ㆍOriel Instruments
ㆍOriental Yeast Co. Ltd.
ㆍOriginLab Corporation
ㆍOrion Diagnostca
ㆍOrion Research Inc.
ㆍOrion Telescope and Binocular Center
ㆍOrlando Clinical Research Center
ㆍOrnat
ㆍOrtho-Clinical Diagnostics
ㆍOrthodyne
ㆍOsborn Laboratories
ㆍOsborn Scientific
ㆍOsmonics Inc.
ㆍOsmonics Laboratory Products
ㆍOsmonics Poretics Products
ㆍOsteoMetrics Inc.
ㆍOster Professional Products
ㆍOstex International Inc.
ㆍOtis Clapp & Son Inc.
ㆍOtsuka Elec
ㆍOTT-LITE Technology
ㆍOut of This World
ㆍOutokumpu Instruments Oy
ㆍOverhoff Technology Corporation
ㆍOwen Mumford Inc.
ㆍOwens-Corning Fiberglas
ㆍOwl Separation Systems
ㆍOxford Ancestors
ㆍOxford BioMedica
ㆍOxford Biomedical Research
ㆍOxford BioTechnology
ㆍOxford Cryosystems Ltd.
ㆍOxford Instruments plc
ㆍOxford Labware
ㆍOxford Molecular Group
ㆍOXIS International Inc.
ㆍOxoid Ltd.
ㆍOxy-Gon Industries Inc.
ㆍOxyrase Inc.
ㆍOyster Bay Pump Works Inc.