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SE177323C1
(OSRAM)
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|
|
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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)
|
|
Telegraph system
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US1854106A
(en)
|
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Automatic telephone system
|
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SE425282B
(sv)
|
|
Datakommunikationsnet
|
|
US2751435A
(en)
|
|
Registering and translating circuits for use in telecommunication systems
|
|
US3169169A
(en)
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|
Traffic observation system
|
|
US1439723A
(en)
|
|
Numbering system for automatic telephone exchanges
|
|
SE125373C1
(OSRAM)
|
|
|
|
SE179533C1
(OSRAM)
|
|
|
|
SE179977C1
(OSRAM)
|
|
|
|
SE178162C1
(OSRAM)
|
|
|
|
SE174700C1
(OSRAM)
|
|
|
|
US2358593A
(en)
|
|
Teletypewriter recording system
|
|
SE176654C1
(OSRAM)
|
|
|
|
US1672101A
(en)
|
|
Telephone system
|
|
US2418406A
(en)
|
|
Selective signaling system
|
|
US1620286A
(en)
|
|
Trouble-indicating system
|
|
US1210604A
(en)
|
|
Telephone-exchange system.
|
|
SE182714C1
(OSRAM)
|
|
|
|
US2278703A
(en)
|
|
Teletypewriter recording system
|
|
US981399A
(en)
|
|
Telephone trunking system.
|