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United States Patent 1830319

Inventors:
Hartzler, Melvin E.
Romilly, Edgar P.
Publication Date:
11/03/1931
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Assignee:
Hartzler, Melvin E.
Romilly, Edgar P.
Primary Class:
404/10
Other Classes:
404/15
International Classes:
E01F9/06; E01F9/04