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US3691452A
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Control of ac power by a logic comparator
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US3638075A
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Communication line relay system
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US3663760A
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Method and apparatus for time division multiplex transmission of binary data
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US3660606A
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Method and apparatus for time division multiplex transmission of data and voice signals
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US3619649A
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Slow-speed bootstrap sweep circuit
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US3624294A
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Distributed multiplexing of low-speed telegraph subscriber lines
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US3581120A
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Schmitt trigger circuit with variable hysteresis and insensitivity to temperature change
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US3495099A
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Polar leg adapter circuit
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US3529081A
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Means for applying additional communications signals to existing channels
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US3333569A
|
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Metering ribbon inker
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US3522537A
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Vestigial sideband transmission system having two channels in quadrature
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US3504186A
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Data card transmitter with card controlled gating means
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US3562492A
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Tape reader
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US3436477A
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Automatic dialer
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US3411021A
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Line driver for modifying lengths of polar signals
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US3400801A
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Reusable inking cartridge
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US3461276A
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Reusable data card
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US3341192A
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Automatic sheet transport means for message scanning apparatus
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US3381370A
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Waveguide flanging method
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US3366914A
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Solderless connector for printed board circuits
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