Pierre Grandfils

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Precy-sur-Oise, FR

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Patents Grantslast 30 patents

Information Patent Grant
Continuous sliding support gantry for a large passage
- Patent number 4,358,224
- Issue date Nov 9, 1982
- Charbonnages de France
- Guy Blanpain
- E21 - EARTH DRILLING MINING
Information Patent Grant
Sliding supporting gallery
- Patent number 4,348,138
- Issue date Sep 7, 1982
- Charbonnages de France
- Guy Blampain
- E21 - EARTH DRILLING MINING
Information Patent Grant
Thrust device using hydraulic jacks
- Patent number 4,248,136
- Issue date Feb 3, 1981
- Charbonnages de France
- Guy Blanpain
- E21 - EARTH DRILLING MINING
Information Patent Grant
Heavy duty adjustable prop with a ball-and-socket joint
- Patent number 4,231,672
- Issue date Nov 4, 1980
- Charbonnages de France
- Guy Blanpain
- E21 - EARTH DRILLING MINING
Information Patent Grant
Device for causing translation of a tracked machine
- Patent number 4,212,362
- Issue date Jul 15, 1980
- Charbonnages de France
- Guy Blanpain
- E21 - EARTH DRILLING MINING