Tone Boring Co., Ltd.

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Patents Grantslast 30 patents

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
Information Patent Grant
Drill bit for core boring
- Patent number 4,760,888
- Issue date Aug 2, 1988
- Tone Boring Company Limited
- Makoto Saito
- E21 - EARTH DRILLING MINING
Information Patent Grant
Trench excavator
- Patent number 4,718,504
- Issue date Jan 12, 1988
- Tone Boring Co., Ltd.
- Tutomu Terashima
- E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
Information Patent Grant
Boring apparatus provided with drill bits freely rotatable around t...
- Patent number 3,945,445
- Issue date Mar 23, 1976
- Tone Boring Company Limited
- Nobuhisa Ikeda
- E21 - EARTH DRILLING MINING