Kabushiki Kaisha Kematsu Seisakusho

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Patents Grantslast 30 patents

Information Patent Grant
Method of building underground cavern and tunneling machine
- Patent number 5,118,220
- Issue date Jun 2, 1992
- Kabushiki Kaisha Kematsu Seisakusho
- Kihachior Furumi
- E21 - EARTH DRILLING MINING