| AO Medical Products AB ( Stockholm, SE ) | AOCHENGTONGLI ST DEVELOPMENT ( BEIJING ) CO., LTD ( Beijing, CN ) | AOI Seiko Co., Ltd.( Aichi-ken ) |
| AO Medical Products Sweden Aktiebolag( Kista ) | Aoco Limited/Limitee( Toronto ) | AOI SEIKO CO., LTD. ( Aichi-ken, JP ) |
| AO Research Institute Davos( Davos ) | AO-Development Institute Davos( Davos ) | Aoi Studio Co., Ltd. ( Tokyo, JP ) |
| AO Technology AG( Chur ) | AO-Entwicklungsinstitut Davos( Davos ) | AOI Systems, Inc. ( Lowell, MA ) |
| AO TECHNOLOGY AG ( Chur, CH ) | AO-Forschungsinstitut Davos ( Davos, CH ) | AOI Techno Service Kabushiki Kaisha( Hiroshima ) |
| AO:s Metall Mek. Verkstad AB( Stockholm ) | AO-Forschungsinstitut Davos ( Davos Platz, CH ) | AOI Techno Service Kabushiki Kaisha ( Hiroshima, JP ) |
| AOA Apparatebau Gauting GmbH( Gauting ) | AOI CO., LTD. | AOI TECHNO. SERVICE KABUSHIKI KAISHA ( Hiroshima-shi, JP ) |
| AOA Luftfahrtgeraete Gauting GmbH ( Gauting, DE ) | AOI Electronics Co., LTD( Kagawa-Ken ) | Aoki Corporation ( Acton, MA ) |
| Aoba Kasei Kabushiki Kaisha | AOI Electronics Co., Ltd. ( Chiba-shi, JP ) | Aoki Corporation ( Osaka, JP ) |
| Aoba Shigyo Company, Limited( both of ) | Aoi Electronics Co., Ltd.( Kagawa ) | Aoki Electric Ind. Co., Ltd.( Tokyo ) |
| AOBA TECHNOLOGY CO., LTD. | AOI Electronics Co., Ltd. ( Kagawa, JP ) | Aoki Kogyo Kabushikikaisha( Chiba ) |
| Aoba Technology Co., Ltd.( Chung Li ) | AOI Electronics Co., Ltd.( Takamatsu-shi ) | Aoki Laboratories Ltd.( Hong Kong ) |
| AOC Technologies ( Dublin, CA ) | AOI Electronics Co., Ltd. ( Takamatsu-shi, JP ) | Aoki Laboratories Ltd. ( Hong Kong, HK ) |
| Aoc Technologies, Inc. ( Dublin, CA ) | AOI ELECTRONICS CO., LTD. ( Tokyo, JP ) | Aoki Machinery Co., Ltd.( Fuji ) |
| AOC, Inc. ( Scottsdale, AZ ) | AOI Foils Limited( West Lothian ) | Aoki Machinery Co., Ltd. ( Fuji, JP ) |
| AOC, L.L.C. ( Collierville, TN ) | AOI Medical, Inc. ( Orlando, FL ) | AOKI SCIENCE INSTITUTE CO., LTD. ( RYOBI LTD., KOTOBUKI KINZOKU KOGYO CO., LTD. ) |
| AOC, LLC ( Collierville, TN ) | Aoi Plastic K.K. ( Tokyo, JP ) | |
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