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Ryuzaburo Otsuka
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Aichi, JP
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last 30 patents
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Patent Grant
Control system for synchronous rotation of cutter heads, for use in...
Patent number
4,939,431
Issue date
Jul 3, 1990
Ishikawajima-Harima Kukogyo K.K.
Hidetsugu Yamazaki
E21 - EARTH DRILLING MINING