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US1914384A
(en)
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|
Telephone system
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US2416086A
(en)
|
|
Automatic selecting switch
|
|
SE177395C1
(OSRAM)
|
|
|
|
US1956371A
(en)
|
|
Telephone system
|
|
US2504708A
(en)
|
|
Selecting-switch for use in telephone systems
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|
GB194580A
(en)
|
|
Improvements in or relating to telephone systems
|
|
US1688162A
(en)
|
|
Stehlik |
|
US1559736A
(en)
|
|
Secondary trunking system
|
|
US1479442A
(en)
|
|
Metering telephone system
|
|
US2087398A
(en)
|
|
Automatic switch for use in telephone or like systems
|
|
US1944269A
(en)
|
|
Telephone system
|
|
US2574903A
(en)
|
|
Translator for shifted lines and parties
|
|
US2552719A
(en)
|
|
Automatic registering device for impulse series
|
|
US2013169A
(en)
|
|
Selecting switch for use in telephone systems
|
|
US1556474A
(en)
|
|
Automatic switching system
|
|
US1710490A
(en)
|
|
Automatic telephone system
|
|
US2508656A
(en)
|
|
Interconnecting arrangement between telephone systems of the strowger and rotary revertive control types
|
|
US1747224A
(en)
|
|
Telephone-exchange system
|
|
US1541388A
(en)
|
|
Automatic telephone-exchange system
|
|
US1877672A
(en)
|
|
Telephone plant
|
|
US1541367A
(en)
|
|
Telephone-exchange system
|
|
US1360738A
(en)
|
|
Telephone system |
|
US1326680A
(en)
|
|
Automatic telephone trunkinft system |
|
US1468853A
(en)
|
|
Telephone-exchange system
|
|
US1167646A
(en)
|
|
Machine telephone switching system.
|