Owl calling whistle

Measuring – testing – or signalling instruments – Security or signal instrument or casing – Aural – i.e. – audible

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D21 64

Patent

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D02796589

REFERENCES:
patent: D178485 (1956-08-01), Bacon
patent: 194119 (1877-08-01), Arpisella
patent: 1014302 (1912-01-01), Hawley
patent: 2880548 (1959-04-01), Garr
The Sporting Dealer, 9/1972, all Game Callers on this p. 58.

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