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Multiple Point Antifriction Bearing Rotary Drilling Bit, View 1
One of six mounted photographs in a folder of a multiple point antifriction bearing rotary drilling bit, invented by William Bruce Flynn.
Multiple Point Antifriction Bearing Rotary Drilling Bit, View 2
One of six mounted photographs in a folder of a multiple point antifriction bearing rotary drilling bit, invented by William Bruce Flynn.
Multiple Point Antifriction Bearing Rotary Drilling Bit, View 3
One of six mounted photographs in a folder of a multiple point antifriction bearing rotary drilling bit, invented by William Bruce Flynn.
Multiple Point Antifriction Bearing Rotary Drilling Bit, View 4
One of six mounted photographs in a folder of a multiple point antifriction bearing rotary drilling bit, invented by William Bruce Flynn.
Caption below image reads: Evidence that there is in existence this 18th day of June, 1931, a complete a…
Caption below image reads: Evidence that there is in existence this 18th day of June, 1931, a complete a…
Multiple Point Antifriction Bearing Rotary Drilling Bit, View 5
One of six mounted photographs in a folder of a multiple point antifriction bearing rotary drilling bit, invented by William Bruce Flynn.
Caption below image reads: "Evidence that the one and only inventor of this drilling bit is William Bruce…
Caption below image reads: "Evidence that the one and only inventor of this drilling bit is William Bruce…
Multiple Point Antifriction Bearing Rotary Drilling Bit, View 6
One of six mounted photographs in a folder of a multiple point antifriction bearing rotary drilling bit, invented by William Bruce Flynn.
Writing below image includes witnesses to the creation of the invention and notary public signature dated…
Writing below image includes witnesses to the creation of the invention and notary public signature dated…