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MY7400094A
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Improvements in or relating to automatic telephone exchange systems
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GB1206070A
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Improvements in or relating to telephone exchanges
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US3597548A
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Time division multiplex switching system
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GB1245072A
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Improvements in or relating to checking and fault indicating arrangements
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GB1224665A
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Improvements in or relating to communications systems
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GB1223885A
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Improvements in or relating to automatic telephone exchanges
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GB1211479A
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Improvements in or relating to automatic telephone exchanges
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GB1202580A
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Improvements in or relating to circuit arrangements for use in telephone systems
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GB1200230A
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Improvements in or relating to circuit arrangements for use in telecommunication systems
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GB1201647A
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Improvements in or relating to electric signal storage arrangements
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GB1219416A
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Improvements in or relating to telephone accounting and traffic analysis equipment
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GB1198469A
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Circuit Arrangements for Controlling the Setting-up of Connections
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GB1192649A
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Improvements in or relating to Arrangements for Mounting Electrical Connectors
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GB1237379A
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Improvements in or relating to automatic telephone systems
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GB1220680A
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Improvements relating to data transmission systems
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GB1177566A
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Group Selector Arrangements.
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GB1220679A
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Improvements in or relating to shift registers
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GB1199762A
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Improvements relating to Switching Arrangements
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GB1181983A
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Improvements in or relating to Data Processing Circuit Arrangements
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GB1206781A
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Improvements in or relating to automatic telephone systems
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