BRUSH WEAR INDICATOR
United States Patent 3523288

Inventors:
Thompson, Harris A.
Publication Date:
08/04/1970
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Assignee:
Harris, Thompson A.
Primary Class:
340/648
Other Classes:
310/245, 310/239
International Classes:
G01R31/34; H01R39/58; H01R39/00; G08B21/00; H01H1/36




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