Nakatsuka; K.

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Miyagi, JP

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Patents Grantslast 30 patents

Information Patent Grant
Method of drilling a well by utilizing AE/MA measurement
- Patent number 4,924,950
- Issue date May 15, 1990
- Nakatsuka; K.
- Hiroaki Niitsuma
- E21 - EARTH DRILLING MINING
Information Patent Grant
Method of collecting geothermal steam using AE/MA measurement
- Patent number 4,739,830
- Issue date Apr 26, 1988
- Japan Metals & Chemicals Co., Ltd.
- Hiroaki Niitsuma
- F24 - HEATING RANGES VENTILATING