GB105332A
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Improvements in or relating to Electrical Selectors.
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GB191512671A
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Improvements in Impulse Transmitters for Automatic Telephone Systems.
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US1257180A
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Impulse-transmitter for automatic telephone systems.
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GB191418076A
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Improvements in Selecting Devices for Automatic or Semi-automatic Telephone Systems.
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GB191417415A
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Improvements in Automatic or Semi-automatic Telephone Exchange Systems.
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GB191416619A
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Improvements in Selectors for Automatic Telephone Systems.
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GB191409840A
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Improvements in or relating to Automatic or Semi-automatic Telephone Exchange Systems.
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GB191408946A
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Improvements in Automatic or Semi-automatic Telephone Systems.
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GB191406210A
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Improvements in or relating to Automatic or Semi-automatic Telephone Exchange Systems.
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US1129543A
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Automatic or semi-automatic telephone-exchange system.
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GB191404819A
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Improvements in or relating to Selectors, especially suitable for use with Automatic or Semi-automatic Telephone Systems.
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CA163294A
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Telephone impulse transmitter
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GB191306465A
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Improvements in or relating to Selectors especially for use with Automatic Telephone Exchanges.
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GB191304792A
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Improvements in or relating to Impulse Transmitters for Automatic Telephone Plant.
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GB191200410A
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Improvements in or relating to Electrical Selective Connecting Apparatus Operated from a Distance.
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US1064957A
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Electrical connecting apparatus.
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GB191125216A
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Improvements in Automatic Telephone Systems.
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GB191119661A
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Improvements in Impulse Transmitters for Automatic Exchange Telephone Systems.
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GB191119553A
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Improvements in or relating to Electrical Connecting Apparatus Operated from a Distance.
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US1070104A
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Telephone system.
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