Toshinori Asahi

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Osaka, JP

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Patents Grantslast 30 patents

Information Patent Grant
Shield tunneling with optional section and machine
- Patent number 4,998,776
- Issue date Mar 12, 1991
- Zaidan Hohjin Doboku Kenkyu Center
- Shohei Chida
- E21 - EARTH DRILLING MINING
Information Patent Grant
Rock crushing device and a method thereof
- Patent number 4,721,339
- Issue date Jan 26, 1988
- Okumura Corporation
- Mituya Sakai
- E21 - EARTH DRILLING MINING