Tekken Construction Co., Ltd.

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Tokyo, JA

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Patents Grantslast 30 patents

Information Patent Grant
Automatic tunnel face hydraulic pressure controlling apparatus in s...
- Patent number 4,068,484
- Issue date Jan 17, 1978
- Tekken Construction Co., Ltd.
- Yasuyuki Iwamitu
- E21 - EARTH DRILLING MINING
Information Patent Grant
Automatic tunnel face hydraulic pressure controlling apparatus in s...
- Patent number 4,068,486
- Issue date Jan 17, 1978
- Tekken Construction Co., Ltd.
- Yoshiaki Uchida
- E21 - EARTH DRILLING MINING

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