Ott Antriebe
OTT Hydromet
Oswald
Osterrath
Ostberg
Osram
OSL（Ovation Systems Ltd）
Oslv
Oskar Schwenk
Osip
OSI Optoelectronics
OSG
Osco
Osborn
Osaki（日）
Osaki
Osaka jack
OSAI
Ortec
Orthodyne
