BE476047A - - Google Patents

Info

Publication number: BE476047A
Authority: BE; Belgium

Application number

Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)

1939-08-16

Publication of BE476047A publication Critical patent/BE476047A/xx

Classifications

- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q1/00—Details of selecting apparatus or arrangements
- H04Q1/18—Electrical details
- H04Q1/30—Signalling arrangements; Manipulation of signalling currents
- H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
- H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
- H04Q1/45—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling
- H04Q1/453—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling in which m-out-of-n signalling frequencies are transmitted
- H04Q1/4535—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling in which m-out-of-n signalling frequencies are transmitted with an additional signal transmitted for voice protection

Landscapes

Engineering & Computer Science (AREA)
Computer Networks & Wireless Communication (AREA)
Telephonic Communication Services (AREA)
Interface Circuits In Exchanges (AREA)

BE476047D 1939-08-16 BE476047A (mo)

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
GB268998X		1939-08-16

Publications (1)

Publication Number	Publication Date
BE476047A true BE476047A (mo)

Family

ID=10250964

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
BE476047D BE476047A (mo)	1939-08-16

Country Status (5)

Country	Link
US (1)	US2593512A (mo)
BE (1)	BE476047A (mo)
CH (1)	CH268998A (mo)
FR (1)	FR947898A (mo)
GB (1)	GB534023A (mo)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US1575272A (en) *	1923-10-31	1926-03-02	Western Electric Co	Telephone system
US2188461A (en) *	1935-06-11	1940-01-30	Ass Telephone & Telegraph Co	Mechanical impulse repeater
GB489755A (en) *	1937-01-25	1938-07-25	Standard Telephones Cables Ltd	Improvements in or relating to electric signalling systems

0
- BE BE476047D patent/BE476047A/xx unknown
1939
- 1939-08-16 GB GB23656/39A patent/GB534023A/en not_active Expired
1947
- 1947-03-22 CH CH268998D patent/CH268998A/de unknown
- 1947-06-07 US US753220A patent/US2593512A/en not_active Expired - Lifetime
- 1947-06-13 FR FR947898D patent/FR947898A/fr not_active Expired

Also Published As

Publication number	Publication date
US2593512A (en)	1952-04-22
CH268998A (de)	1950-06-15
GB534023A (en)	1941-02-26
FR947898A (fr)	1949-07-15

Publication	Publication Date	Title
FR850243A (mo)	1939-12-11
FR961528A (mo)	1950-05-13
BE428333A (mo)
BE435823A (mo)
BE433994A (mo)
BE434647A (mo)
BE432222A (mo)
BE436007A (mo)	1939-09-30
BE432967A (mo)
BE432823A (mo)
BE461307A (mo)
BE432683A (mo)
BE445934A (mo)
BE433833A (mo)
BE433599A (mo)
BE432632A (mo)
BE435664A (mo)	1939-08-31
BE431181A (mo)
BE436022A (mo)
BE435911A (mo)
BE434846A (mo)
BE433403A (mo)
BE461243A (mo)
BE413600A (mo)
BE436027A (mo)