O'Brien John P.
O'Callaghan John S.
Office Meccaniche G. Cerutti S.p.A.
Officine Meccaniche Cigardi S.p.A.
Ohlhauser Stefan
Ohlsson Jarl E. S. I.
Ohmi Takashi
Okubo Hiromasa
Okuda Yukito
OMET S.r.l.
Orzechowski Thomas W.
Oschay Johann
Otfried Rudolph
Oumiya Nobuyoshi
Oyoshi Hisaaki