Device for viewing oil well bore hole
United States Patent 2912495

Inventors:
James, Moon
Crooke, Robert C.
Publication Date:
11/10/1959
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Assignee:
James, Moon
Crooke, Robert C.
Primary Class:
348/85
International Classes:
E21B47/00
US Patent References:
2638675Drafting machine
2671323Apparatus for cooling well surveying instruments
2677996Borehole camera apparatus
2737864Borehole camera
2812697Stepped progression borehole camera apparatus