Title:
Rotary drilling and borehole coring apparatus and method
United States Patent 3227228

Inventors:
Bannister, Clyde E.
Publication Date:
01/04/1966
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Assignee:
Bannister, Clyde E.
Primary Class:
175/4
Other Classes:
175/4.540, 175/58, 175/4.560
International Classes:
E21B49/04; E21B49/00
US Patent References:
2761385Devices for controlling the firing of charges of powder or explosives from a distance
2917280Sample taking apparatus
3016959Core sampling arrangement for operation inside geological layers
3072202Core taker devices