Frank A. Hollingshead

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Houston, TX, US

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Patents Grantslast 30 patents

Information Patent Grant
Rolling cutter drill bit
- Patent number 4,158,973
- Issue date Jun 26, 1979
- Reed Tool Company
- Percy W. Schumacher
- B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
Information Patent Grant
Drill bit
- Patent number 4,080,091
- Issue date Mar 21, 1978
- Reed Tool Company
- Frank A. Hollingshead
- E21 - EARTH DRILLING MINING