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| Patents for G10K 7 - Sirens (209) |
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| 08/26/1980 | US4219705 Sound production using large volume plasmas | | 04/15/1980 | US4198706 Generation of low frequency sound under water | | 01/09/1980 | EP0006833A2 Low-frequency sound generator | | 02/06/1979 | US4138673 Small siren having protective screen | | 01/30/1979 | US4136971 Apparatus for creating acoustic oscillations in a running liquid medium | | 10/03/1978 | US4118796 Device for producing acoustic vibration in flowing liquid or gaseous medium | | 08/02/1977 | US4040003 Downhole seismic source | | 11/16/1976 | US3991703 Siren for alarm and method of making the same | | 03/09/1976 | US3942468 Back pressure operated sound transmitter |
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