Pneumatic horn

Details Pneumatic horn Pneumatic horn

1991-07-15

1992-01-14

Burke, Wallace R.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Aural, i.e., audible

Patent

active

D03231283

REFERENCES:
patent: D74584 (1928-02-01), White
patent: D138406 (1944-08-01), Hadley
patent: D194293 (1962-12-01), Sullivan
patent: D194738 (1963-03-01), Green
patent: 2778330 (1957-01-01), Jacoby
patent: 2840032 (1958-06-01), Reeves
patent: 3477405 (1969-11-01), Jensen
patent: 3670690 (1972-06-01), Swanson
patent: 3961597 (1976-06-01), Zester et al.

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