Duration impulse receiver
United States Patent 2421022

Inventors:
Francis, Oliver T.
Publication Date:
05/27/1947
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Assignee:
Francis, Oliver T.
Primary Class:
340/825.640
Other Classes:
377/20, 329/312, 327/31, 341/182
International Classes:
H03K9/08; H03K9/00
US Patent References:
2334575Selective signaling system
1597763Printing telegraphy
1637080Electric signal transmitter
2350551Electric switch apparatus
Foreign References:
GB545399A