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US4959852A
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Telephone answering machine having solid state and magnetic tape storage for outgoing announcements
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US4823338A
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Virtual local area network
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US4862498A
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Method and apparatus for automatically selecting system commands for display
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US4646101A
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Antenna support
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US4658333A
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Variable length backplane bus
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US4649468A
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Voltage divider circuit
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US4652701A
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Ringing application circuit
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US4617663A
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Interface testing of software systems
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US4650269A
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Modular plug connector
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US4653823A
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Electrical connector apparatus
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US4633461A
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Switching control for multiple stage time division switch
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US4635249A
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Glitchless clock signal control circuit for a duplicated system
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US4639781A
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Dynamic gain adjuster for an image scanner
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US4613987A
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Image scanning arrangement
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US4716376A
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Adaptive FSK demodulator and threshold detector
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US4612416A
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Integrated message service system
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US4602128A
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Automatic redialing arrangement for multi-line telephone station sets
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US4600812A
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Communication system having abbreviated dialing access
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US4631534A
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Distributed packet switching system
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US4629832A
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Communication system administration method and circuitry
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