Frame type supports

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Patents Grantslast 30 patents

Information Patent Grant
Walking roof support
- Patent number 4,293,248
- Issue date Oct 6, 1981
- Centralny Osrodek Projektowo-Konstrukcyjny Maszyn Gorniczych "Komag"
- Wincenty Pretor
- E21 - EARTH DRILLING MINING
Information Patent Grant
Mine roof support system
- Patent number 4,143,991
- Issue date Mar 13, 1979
- Frank Stafford
- E21 - EARTH DRILLING MINING
Information Patent Grant
Advancing support
- Patent number 4,129,990
- Issue date Dec 19, 1978
- Charbonnages de France
- Alfred Valantin
- E21 - EARTH DRILLING MINING
Information Patent Grant
3754402
- Patent number 3,754,402
- Issue date Aug 28, 1973
- E21 - EARTH DRILLING MINING
Information Patent Grant
3512364
- Patent number 3,512,364
- Issue date May 19, 1970
- E21 - EARTH DRILLING MINING