Title:
Tuning device
United States Patent 2909727

Inventors:
Andersen, Clifford W.
Publication Date:
10/20/1959
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Assignee:
WURLITZER CO
Primary Class:
324/76.410
Other Classes:
324/76.510, 331/51, 984/260, 84/DIG.018, 84/454, 331/55, 324/88, 984/353, 331/48
International Classes:
G10G7/02; G10H1/44; G10G7/00
US Patent References:
2323956Oscillation generator
2494919Socket for holding a crystal
2538184Electronic piano tuning
2614221Frequency control device
2749515Direct-reading frequency meter
2763836Frequency measuring receiver
2806953Electronic oscillator for producing frequencies of musical tones