Hidetsugu Yamazaki

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Ibaraki, JP

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Patents Grantslast 30 patents

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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