GB229651A
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Improvements in or relating to automatic telephone systems
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GB214861A
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Improvements in or relating to automatic telephone systems
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US1527433A
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Automatic telephone switch
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US1527434A
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Automatic telephone system
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GB200781A
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Improvements in or relating to automatic telephone systems
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GB199327A
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Improvements relating to automatic telephone systems
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US1481104A
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Electromagnetic relay
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GB186433A
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Improvements relating to electro-magnetic and polarised relays
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GB189824A
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Improvements relating to automatic telephone systems
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GB189823A
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Improvements in or relating to metering or registering means with special reference to automatic telephone systems
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GB189822A
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Improvements in or relating to motor mechanism with special reference to switch arrangements for automatic telephone systems
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US1409737A
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Automatic telephone system
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GB153238A
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Improved selector apparatus for use in an automatic or semi-automatic telephone system
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GB153167A
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Improvements in or relating to telephone systems
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GB152702A
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An improved automatic telephone system
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