Osborn
Oerlikon Leybold
OLAER
Omil
OMT
OMC
OTTO GANTER
Oleodinamica Gambini
Omron
OIL CONTROL
Officine Orobiche
ONDA
Ondal
Olocco
Ovitor
OXYDENT
OLDHAM 奥德姆
O.ERRE（OERRE）
