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US3292087A
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Signal monitoring and switching circuits for a terminal facility
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US3194988A
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Hub driver utilizing clamping network and means to controllably isolate hub circuit from clamping network
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US3141930A
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Digital signal synchronizer system
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US3129286A
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Signal distortion analyzer
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US3130268A
|
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Signal distortion monitor
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US3185963A
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Synchronizing system having reversible counter means
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US3025349A
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Communications monitoring system
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US3170037A
|
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Electronic relay
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US3057958A
|
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Telegraph test set
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US2953641A
|
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Regenerative repeater system
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US2990444A
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Data counter
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US2961489A
|
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Telegraph single space or mark pulse distortion monitor
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US2930849A
|
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Telegraph repeater system
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US2808457A
|
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Apparatus for monitoring a plurality of telegraph loops
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US2856458A
|
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Telegraph distortion analyzer
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US2712038A
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Apparatus for analyzing distortions in telegraph signals
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