Automatic annunciator
United States Patent 2099868

Inventors:
Jung, Sing Lang
Waunch, Robert M.
Publication Date:
11/23/1937
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Assignee:
Jung, Sing Lang
Waunch, Robert M.
Primary Class:
369/226
Other Classes:
340/942, 187/396, 250/214R, 340/556, 250/221, 250/226
International Classes:
G09F19/18; G09F19/12