Electronic tuning device
United States Patent 2584277

Inventors:
Long, Thomas H.
Publication Date:
02/05/1952
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Assignee:
CONN LTD C G
Primary Class:
331/75
Other Classes:
331/179, 84/DIG.018, 84/454, 331/170, 984/353, 331/64, 331/186, 331/175
International Classes:
G10H1/44
US Patent References:
2440284Thermionic valve circuits
2441334Signal level and phase control
Foreign References:
DE338510C