Anchoring method and apparatus
United States Patent 2988893

Inventors:
Borrmann, Gerald F.
Johnson, Laurence E.
Schurman, Glenn A.
Publication Date:
06/20/1961
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Assignee:
CALIFORNIA RESEARCH CORP
Primary Class:
405/226
Other Classes:
405/225, 52/148
International Classes:
B63B21/50; E21B7/12; B63B21/00
Foreign References:
DE720032C