Interval signalling timer

Measuring – testing – or signalling instruments – Time-measuring instrument or casing

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D1002

Patent

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D02437481

REFERENCES:
patent: D237260 (1975-10-01), Innes
patent: D238760 (1976-02-01), Daum
patent: 3088270 (1963-05-01), King
Jeweler's Circular-Keystone, Dec. 1973, p. 124 - Timer at bottom-right.

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