Tetsuji Hirotsu

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Katsuta, JP

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Patents Grantslast 30 patents

Information Patent Grant
Control apparatus for maintaining traction in electric rolling stock
- Patent number 4,799,161
- Issue date Jan 17, 1989
- Hitachi, Ltd.
- Tetsuji Hirotsu
- B60 - VEHICLES IN GENERAL
Information Patent Grant
Truck for railway vehicle
- Patent number 4,776,283
- Issue date Oct 11, 1988
- Hitachi, Ltd.
- Takao Shozi
- B61 - RAILWAYS
Information Patent Grant
Control system for maintaining traction of rolling stock
- Patent number 4,701,682
- Issue date Oct 20, 1987
- Hitachi, Ltd.
- Tetsuji Hirotsu
- B60 - VEHICLES IN GENERAL