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Interoffice loop supervision arrangement
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Memory sparing arrangement
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Transformerless two-wire/four-wire hybrid with DC sourcing capability
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Water-proof air-pressure equalizing valve
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Framing circuit for digital receiver
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Stand-alone cumulative elapsed-time calculating system
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Drive circuit for power switching device
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Power switching control circuit with enhanced turn-off drive
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Converter circuit and method having fast responding current balance and limiting
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Encoding scheme for failure detection in random access memories
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Method and apparatus for path testing in a time division multiplex switching network
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Small modular communications switching system with distributed programmable control
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Asynchronous bit-serial data receiver
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Variable flux-reset ferroresonant voltage regulator
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Signal coding for telephone communication system
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Signal coding for telephone communication system
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US3916295A
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Ferroresonant voltage regulator stabilized for light load conditions
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US3930170A
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Switching transistor drive apparatus
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US3963872A
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Non-symmetric folded four-stage switching network
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US3882412A
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Drift compensated phase lock loop
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