Electronic sound transmitting device
United States Patent 2950357

Inventors:
Mitchell, Robert E.
Webster, Stanley K.
Publication Date:
08/23/1960
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Assignee:
Mitchell, Robert E.
Webster, Stanley K.
Primary Class:
381/323
Other Classes:
381/328, 381/120
International Classes:
H04R25/00
US Patent References:
2544027Hearing aid attachment for use on french type telephones
2613282Spectacle type hearing aid
2765373Hearing aid, construction and support therefor
2775652Hearing aid casing
2777057Radiation powered transistor circuits
2787670Hearing aid
2824177Hearing aid amplifier
2830132Hearing aid and spectacles combination
2856466Hearing aids
Foreign References:
DE922889C
FR1089681A