exact
POLYPHASE DUPLEX
exact
POLYPHASE DUPLEX
Trademarks matching 'polyphase duplex'
Summary of page content
1924-05-29
190958
1924-10-28
US
-
9
Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments; apparatus and instruments for conducting, switching, transforming, accumulating, regulating or controlling electricity; apparatus for recording, transmission or reproduction of sound or images; magnetic data carriers, recording discs; automatic vending machines and mechanisms for coin-operated apparatus; cash registers, calculating machines, data processing equipment and computers; fire-extinguishing apparatus.
(calculating) slide rules
2020-05-31
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