Keizo Ishikawa

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Yamato, JP

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Patents Grantslast 30 patents

Information Patent Grant
Tendon for prestressed concrete
- Patent number 4,648,224
- Issue date Mar 10, 1987
- Japanese National Railways
- Toshiyuki Kitta
- E04 - BUILDING
Information Patent Grant
Method of erecting a bridge girder
- Patent number 4,320,548
- Issue date Mar 23, 1982
- Oiles Co., Ltd.
- Hiroshi Tada
- E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES