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United States Patent 2427330
US Patent References:
/0891065.html
- - 0891065
/1242539.html
- - 1242539
/0387675.html
- - 0387675
Inventors:
Lloyd, Spencer
Publication Date:
09/09/1947
View Patent Images:
Download PDF 2427330
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Assignee:
LANE WELLS CO
Primary Class:
166/208
Other Classes:
285/396, 285/922, 285/123.110, 285/307, 166/215, 285/2
International Classes:
E21B43/10
;
E21B43/02