Taro Watanabe

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Tokyo, JP

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Patents Grantslast 30 patents

Information Patent Grant
Multiple air hammer apparatus and excavating direction correcting m...
- Patent number 6,467,558
- Issue date Oct 22, 2002
- Tone Corporation
- Osamu Miyamoto
- E21 - EARTH DRILLING MINING
Information Patent Grant
Extendable bit
- Patent number 5,881,827
- Issue date Mar 16, 1999
- Tone Corporation
- Nobuhisa Ikeda
- E21 - EARTH DRILLING MINING
Information Patent Grant
Air pressure impact drilling method and apparatus for same
- Patent number 4,790,391
- Issue date Dec 13, 1988
- Tone Boring Co., Ltd.
- Hiroyuki Hamamura
- E21 - EARTH DRILLING MINING