Dual-coil speaker transmits warning signals and intercom messages. It saves power by allowing signals to be heard with intercom electronics turned off.
Double-duty loudspeaker
NASA Tech Briefs ; 2 , 2
01.11.1977
Sonstige
Keine Angabe
Englisch
Loudspeaker mounting frame, loudspeaker and loudspeaker cabinet
Europäisches Patentamt | 2019
|LOUDSPEAKER, ELECTRONIC APPARATUS USING LOUDSPEAKER, AND MOBILE EQUIPMENT USING LOUDSPEAKER
Europäisches Patentamt | 2017
|LOUDSPEAKER, ELECTRONIC APPARATUS USING LOUDSPEAKER, AND MOBILE EQUIPMENT USING LOUDSPEAKER
Europäisches Patentamt | 2015
|Loudspeaker, electronic apparatus using loudspeaker, and mobile equipment using loudspeaker
Europäisches Patentamt | 2017
|