NL7613987A - Schakelinrichting voor telefoonconferentie- stelsels. - Google Patents

Schakelinrichting voor telefoonconferentie- stelsels.

Info

Publication number
NL7613987A
NL7613987A NL7613987A NL7613987A NL7613987A NL 7613987 A NL7613987 A NL 7613987A NL 7613987 A NL7613987 A NL 7613987A NL 7613987 A NL7613987 A NL 7613987A NL 7613987 A NL7613987 A NL 7613987A
Authority
NL
Netherlands
Prior art keywords
switching device
telephone conference
conference systems
systems
telephone
Prior art date
Application number
NL7613987A
Other languages
English (en)
Dutch (nl)
Original Assignee
Post Office
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.)
Filing date
Publication date
Priority claimed from GB51587/75A external-priority patent/GB1565200A/en
Application filed by Post Office filed Critical Post Office
Publication of NL7613987A publication Critical patent/NL7613987A/xx

Links

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

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Amplifiers (AREA)
  • Interface Circuits In Exchanges (AREA)
NL7613987A 1975-12-17 1976-12-16 Schakelinrichting voor telefoonconferentie- stelsels. NL7613987A (nl)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB51587/75A GB1565200A (en) 1976-01-06 1975-12-17 Switching circuit

Publications (1)

Publication Number Publication Date
NL7613987A true NL7613987A (nl) 1977-06-21

Family

ID=10460615

Family Applications (1)

Application Number Title Priority Date Filing Date
NL7613987A NL7613987A (nl) 1975-12-17 1976-12-16 Schakelinrichting voor telefoonconferentie- stelsels.

Country Status (5)

Country Link
BE (1) BE849549A (enrdf_load_stackoverflow)
CA (1) CA1064632A (enrdf_load_stackoverflow)
FR (1) FR2335999A1 (enrdf_load_stackoverflow)
NL (1) NL7613987A (enrdf_load_stackoverflow)
SE (1) SE424396B (enrdf_load_stackoverflow)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3502905A (en) * 1967-05-17 1970-03-24 Honeywell Inc Differential amplifier and field effect transistor gates for applying largest of two inputs to output
GB1395495A (en) * 1971-06-30 1975-05-29 Post Office Telephone conference amplifier

Also Published As

Publication number Publication date
FR2335999B1 (enrdf_load_stackoverflow) 1982-07-09
FR2335999A1 (fr) 1977-07-15
SE7614149L (sv) 1977-06-18
SE424396B (sv) 1982-07-12
CA1064632A (en) 1979-10-16
BE849549A (fr) 1977-04-15

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Legal Events

Date Code Title Description
BA A request for search or an international-type search has been filed
BT A notification was added to the application dossier and made available to the public
BB A search report has been drawn up
BC A request for examination has been filed
A85 Still pending on 85-01-01
BV The patent application has lapsed