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SE177323C1
(https=)
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GB583434A
(en)
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Improvements in traffic recording equipment for use in telephone or like systems
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GB431855A
(en)
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Improvements in and relating to calling impulse transmitters for automatic telephone systems or the like
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US2488797A
(en)
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Electrically operated timing arrangement
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GB1220680A
(en)
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Improvements relating to data transmission systems
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US1533171A
(en)
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Telegraph system
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US2751435A
(en)
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Registering and translating circuits for use in telecommunication systems
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US2250101A
(en)
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Telephone system
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US3169169A
(en)
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Traffic observation system
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US1916760A
(en)
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Telephone exchange system
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US1439723A
(en)
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Numbering system for automatic telephone exchanges
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SE125373C1
(https=)
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SE424688B
(sv)
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Koncentrationsnet for en telefonstation
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SE179533C1
(https=)
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SE174486C1
(https=)
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US1873440A
(en)
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Rotary distributor phasing circuit
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SE179977C1
(https=)
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SE174700C1
(https=)
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US2358593A
(en)
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Teletypewriter recording system
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SE176654C1
(https=)
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SE182714C1
(https=)
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US2278703A
(en)
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Teletypewriter recording system
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SU455499A1
(ru)
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Устройство фазового пуска
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Ossiannilsson
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Axel Wallengren-fyndet |
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SE181140C1
(https=)
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