"Fooling around with alternating current is just a waste of time. Nobody will use it, ever."
Thomas Edison ; 1889
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| Number | Title | Issue Date |
| 4090042 | Acoustical communications headset The detachable communications headset described herein is all acoustic, comprising support means for a transmitter tube and a receiver tube and for supporting the headset on the user's head. The transmitter and receiver tubes are detachably coupled to com... | 05/16/1978 |