Safety signaling tool for scuba divers and the like

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

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D17 22

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D03288773

REFERENCES:
patent: 2728257 (1955-12-01), Rochobradsky
patent: 2755833 (1956-07-01), Quayle
patent: 3500393 (1970-03-01), Roberton et al.
patent: 4127053 (1978-11-01), Cohen
patent: 4269104 (1981-05-01), Cantos, Jr.

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