Masao Iwaoka

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Tokyo, JP

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Patents Grantslast 30 patents

Information Patent Grant
Audio-visual sheet player
- Patent number D268670
- Issue date Apr 19, 1983
- Gakken Co., Ltd. (Kabushiki Kaisha Gakushu Kenkyusha)
- Masao Iwaoka
- D14 - Recording, communication, or information retrieval equipment