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Yoshiaki Ishida
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Chichibu, JP
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Patents Grants
last 30 patents
Information
Patent Grant
Tunnel boring machine
Patent number
5,915,790
Issue date
Jun 29, 1999
Hazama Corporation
Takashi Sakai
E21 - EARTH DRILLING MINING
Information
Patent Grant
Laser positioner and marking method using the same
Patent number
5,237,384
Issue date
Aug 17, 1993
Sato Kogyo Co., Ltd.
Nobuyuki Fukunaga
G01 - MEASURING TESTING
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Patent Grant
Laser surveying system having a function of marking reference points
Patent number
5,198,868
Issue date
Mar 30, 1993
Sato Kogyo Co., Ltd.
Takeo Saito
G01 - MEASURING TESTING
Information
Patent Grant
Tunnel driving method
Patent number
5,090,325
Issue date
Feb 25, 1992
Sato Kogyo Co., Ltd.
Takeo Saito
E21 - EARTH DRILLING MINING