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United States Patent 2751490

Inventors:
Emerson, David E.
Publication Date:
06/19/1956
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Assignee:
Emerson, David E.
Primary Class:
362/208
Other Classes:
340/321, 362/343
International Classes:
F21V9/00; F21V17/02; F21V17/00
Foreign References:
GB404218A