Ott-Jakob
OT OilTechnology srl
OTC
Otec
Oteco
Otek
Otmt Machines
Ott Antriebe
OTT Hydromet
Oswald
Osterrath
Ostberg
Osram
OSL（Ovation Systems Ltd）
Oslv
Oskar Schwenk
Osip
OSI Optoelectronics
OSG
Osco
