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CA1099359A
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Elongate electrical connector retaining device
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US4165912A
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Offset adapter connector
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US4146751A
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Solid state pulsing apparatus for pulsing selected line relay terminals
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US4145576A
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DTMF and rotary dial signal receiver
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US4121880A
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Elongate electrical connector retaining device
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US4009352A
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Multiple link circuit for a port multiplexer
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Step-servoed tone detector
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US3946163A
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Port multiplexer for telephone signal processing systems
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US3961141A
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Stop time-out until after first DTMF digit dialed circuit
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US3959598A
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Identification forwarding circuit for use with tone-to-pulse converters
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US3912869A
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Multifrequency-to-digital converter
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US3745376A
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Frequency selective circuit including a twin-t notch filter
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US3705417A
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Pulse ratio detector
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US3784758A
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Pulse ratio detector
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US3704348A
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Service observing system
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US3636270A
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Highly selective frequency detection system
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