Controlled reluctance microphone display

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Description

FIG. 1 is a front elevational view of a controlled reluctance microphone educational board showing my new design; and,

FIG. 2 is a rear perspective view thereof.

Referenced Cited
U.S. Patent Documents
3313041 April 1967 Weigang
Other references
  • Symbol Sourcebook, Copyright 1972, p. 128, Wavefronts Symbol at lower left side of page.
Patent History
Patent number: D242856
Type: Grant
Filed: Oct 15, 1974
Date of Patent: Dec 28, 1976
Inventor: Jack N. Holcomb (Fort Lauderdale, FL)
Primary Examiner: Joel Stearman
Assistant Examiner: C. A. Rademaker
Attorney: Herbert C. Schulze
Application Number: 5/514,898
Classifications
Current U.S. Class: Movable Indicator Or Changeable Exhibitor (D19/64)
International Classification: D1907;