ㆍO.M. SEISAKUSHO
ㆍOBARA CORPORATION
ㆍOCHIAI SEIKO
ㆍODYSSEY SYSTEMS
ㆍOGASAWARA PRECISION LAB
ㆍOGIHARA
ㆍOGURA CLUTCH
ㆍOHKURA DENKI
ㆍOHM DENKI
ㆍOHM ELECTRIC
ㆍOHMI SEIKI
ㆍOHNO BELLOWS INDUSTRY
ㆍOHT INC
ㆍOILES KOGYO
ㆍOJIMA
ㆍOKABE DENKI
ㆍOKABE MAIKA
ㆍOKANO DENSEN
ㆍOKANO ELECTRIC
ㆍOKAYA DENKI
ㆍOKAZAKI DENNETSU
ㆍOKI DENSEN
ㆍOKIDENKI INDUSTRIES
ㆍOKI ELECTRIC
ㆍOKITA SEISAKUSHO
ㆍOKUMA
ㆍOKURA YUSOKI LTD
ㆍOKUSU
ㆍOLYMPUS
ㆍOMEGA ENGINEERING INC
ㆍOMRON
ㆍON INDUSTRIES
ㆍONAMBA
ㆍONDA
ㆍONESUTON
ㆍONO SOKKI

ㆍOOJI SEISHI
ㆍOOSAKI
ㆍOPTEC ICHI DENKO
ㆍOPTO
ㆍORC
ㆍORIENTAL MOTOR (VEXTA)
ㆍORGANO CORPORATION
ㆍORIENTAL PHOTO INDUSTRIES
ㆍORIENTEC CORP.
ㆍORIGIN
ㆍORII
ㆍORION KIKAI
ㆍORION MACHINERY LTD
ㆍOSADA
ㆍOSAKA CHAIN
ㆍOSAKA DENKI
ㆍOSAKA DIAMOND
ㆍOSAKA FLOW METER MFG
ㆍOSAKA JACKS
ㆍOSAKA KOHA
ㆍOSAKA MAGNET CO
ㆍOSAKA SANITARY METAL IND.
ㆍOSAKI DENGYOSHA
ㆍOSAME KOGYO
ㆍOSG
ㆍOSHINO
ㆍOTARI
ㆍOTC DAIHEN
ㆍOTSUKA
ㆍOUKYO SOKKI
ㆍOUT KANIHI
ㆍOVAL MACHINE INDUSTRIES
ㆍOZAK
ㆍOZAKI SEISAKUSHO (PEACOCK)
ㆍOZATUKU
ㆍOZAWA