E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/72
E21B 10/00 (2006.01) E21B 10/52 (2006.01) E21B 10/56 (2006.01)
Patent
CA 1092594
ABSTRACT OF THE DISCLOSURE A protruding insert for use in an oil well drill bit is disclosed which insert is made of a hard metal substance and utilizes a tangential spherical surface having opposed flattened sides.
327661
Meredith & Finlayson
Reed Tool Company
LandOfFree
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