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- Oakton
- Oasis
- Ocean Optics
- Octagon
- Odalog
- Ofru
- Ohaus
- OI Analytical
- Oil Trap
- O. Kindler
- Oldham
- Olympus
- Omac
- Omega
- Omega Bio-Tek
- Omega Membranes
- Omega Series
- Omni
- Omnicron
- Omnigel
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- Onix
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- OnSolution
- Onyx
- Opallex
- Operon
- Optec
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- Optical Activity
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- Optical DO
- Opticon Sensors
- Optifix
- OPTIMA Series
- Optiscan
- Optrex
- Orbisphere
- ORDELA
- Order Window
- Organomation
- Oriental Motor
- Orion
- Ormiston Rubber
- Orobiche
- Orpeger-Pharma
- ORTEC
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- Osmonics
- Osram
- OTT
- Ottenschlager
- Ovation
- Oxford Applied Research
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- Oxford Molecular
- Oxis International
- OXM
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- Ozone