SE177568C1 - - Google Patents

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Publication date

1961-01-01

1961-01-01 Publication of SE177568C1 publication Critical patent/SE177568C1/sv

SE177568D SE177568C1 (fr)

Application Number	Priority Date	Filing Date	Title
SE177568T

Publication Number	Publication Date
SE177568C1 true SE177568C1 (fr)	1961-01-01

Application Number	Title	Priority Date	Filing Date
SE177568D SE177568C1 (fr)

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SE (1)	SE177568C1 (fr)

Publication	Publication Date	Title
GB500737A (en)	1939-02-15	Improvements in or relating to telephone systems
US3133995A (en)	1964-05-19	Call awaiting signal telephone circuits
SE177568C1 (fr)	1961-01-01
GB1416546A (en)	1975-12-03	Communciation systems
US2036163A (en)	1936-03-31	Telephone system
US1558872A (en)	1925-10-27	Telephone system
US2302587A (en)	1942-11-17	Telephone trunking system
US2299203A (en)	1942-10-20	Telephone system
GB566779A (en)	1945-01-12	Improvements in electrical signalling systems
US2332966A (en)	1943-10-26	Code call system
US2024581A (en)	1935-12-17	Telegraph toll system
GB616834A (en)	1949-01-27	Improvements in or relating to automatic switches for use in telephone systems
US2726285A (en)	1955-12-06	Dial cord circuit
US2693507A (en)	1954-11-02	Automatic telephone system
US1905711A (en)	1933-04-25	Telephone system
US2876291A (en)	1959-03-03	Telephone call intercepting system
JPS5612164A (en)	1981-02-06	Automatic dialing device
US2704787A (en)	1955-03-22	Telephone trunk supervisory circuit
US2812386A (en)	1957-11-05	Interrupter circuit
US1632051A (en)	1927-06-14	Telephone system
US1724903A (en)	1929-08-20	Telephone system
US1753338A (en)	1930-04-08	Telephone-exchange system
US1247831A (en)	1917-11-27	Telephone system.
US2021287A (en)	1935-11-19	Telephone system
US2108437A (en)	1938-02-15	Automatic telephone system