Battery-condition indicator
United States Patent 1779946

Inventors:
Nelson, Nels S.
Publication Date:
10/28/1930
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Assignee:
George, Peterson
Primary Class:
337/370
Other Classes:
340/636.100, 340/620, 337/380, 320/136, 429/62, 340/636.150
International Classes:
H01M10/48; H01M10/42