Donovan B. Grable

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Long Beach, CA, US

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Patents Grantslast 30 patents

Information Patent Grant
Well head sealing system
- Patent number 4,071,085
- Issue date Jan 31, 1978
- Donovan B. Grable
- E21 - EARTH DRILLING MINING
Information Patent Grant
Well installations employing non-metallic lines, tubing casing and...
- Patent number 4,024,913
- Issue date May 24, 1977
- Donovan B. Grable
- E21 - EARTH DRILLING MINING