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CA1314965C
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Data interface for telephone system
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CA1266717A
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Expansion subsystem for use in a communication system
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CA1261441A
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Programmable subscriber set
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CA1244979A
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Subscriber set programming module
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CA1240089A
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Circuit for maintaining hybrid cancellation of signals in a communication system
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CA1241126A
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Circuit for transmitting data signals via a plurality of addressable latches
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CA1244923A
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Expansion port for use in a communication system
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CA1244924A
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System for interconnecting a pair of communication systems
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CA1244541A
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Communication system having separate unidirectional information signalling
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CA1239718A
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Key telephone system
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CA1169597A
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Home communications and control system
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