BE363032A - - Google Patents

Info

Publication number: BE363032A
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.)

1929-06-22

Publication of BE363032A publication Critical patent/BE363032A/xx

Classifications

- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/42—Systems providing special services or facilities to subscribers
- H04M3/56—Arrangements for connecting several subscribers to a common circuit, i.e. affording conference facilities

BE363032D 1929-06-22 BE363032A (en)

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
DE1944283X		1929-06-22

Publications (1)

Publication Number	Publication Date
BE363032A true BE363032A (en)

Family

ID=7750643

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
BE363032D BE363032A (en)	1929-06-22

Country Status (3)

Country	Link
US (1)	US1944283A (en)
BE (1)	BE363032A (en)
FR (1)	FR680306A (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
FR948355A (en) *	1942-12-31	1949-07-29	Western Electric Co	Coupling device usable in wave transmission systems
US3135829A (en) *	1959-10-09	1964-06-02	Itt	Conference call circuit
US3891801A (en) *	1974-01-21	1975-06-24	Quindar Electronics	Four-way four-wire active bridge
US3885100A (en) *	1974-05-31	1975-05-20	Bell Telephone Labor Inc	Six-port conference amplifier circuit
US4008376A (en) *	1975-10-17	1977-02-15	Bell Telephone Laboratories, Incorporated	Loudspeaking teleconferencing circuit
US4289932A (en) *	1979-10-15	1981-09-15	Reed Roger R	Conferencing communications system

0
- FR FR680306D patent/FR680306A/fr not_active Expired
- BE BE363032D patent/BE363032A/xx unknown
1930
- 1930-05-31 US US458441A patent/US1944283A/en not_active Expired - Lifetime

Also Published As

Publication number	Publication date
US1944283A (en)	1934-01-23
FR680306A (en)	1930-04-26

Publication	Publication Date	Title
FR680306A (en)	1930-04-26
FR41030E (en)	1932-09-17
FR650947A (en)	1929-02-18
BE332768A (en)
NL36024C (en)	1935-07-15
BE357406A (en)
BE357355A (en)
BE357168A (en)	1929-02-28
BE357155A (en)
BE357126A (en)
BE357124A (en)
BE357116A (en)
BE357075A (en)
NL27877C (en)	1932-04-15
NL28081C (en)
BE356979A (en)
BE356773A (en)
BE374798A (en)
BE331572A (en)
BE354333A (en)
NL29154C (en)	1933-03-15
NL29168C (en)
BE354157A (en)
BE352511A (en)
BE351620A (en)