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Brian J. Armstrong
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Seal Beach, CA, US
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last 30 patents
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Patent Grant
Hard facing for milled tooth rock bits
Patent number
4,944,774
Issue date
Jul 31, 1990
Smith International, Inc.
Madapusi K. Keshavan
B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
Information
Patent Grant
Hard facing for milled tooth rock bits
Patent number
4,836,307
Issue date
Jun 6, 1989
Smith International, Inc.
Madapusi K. Keshavan
B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR