GB643973A - Improvements in or relating to private telephone exchange systems - Google Patents

Improvements in or relating to private telephone exchange systems

Info

Publication number
GB643973A
GB643973A GB5271/46A GB527146A GB643973A GB 643973 A GB643973 A GB 643973A GB 5271/46 A GB5271/46 A GB 5271/46A GB 527146 A GB527146 A GB 527146A GB 643973 A GB643973 A GB 643973A
Authority
GB
United Kingdom
Prior art keywords
relating
telephone exchange
exchange systems
private telephone
feb
Prior art date
Legal status (The legal status 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 status listed.)
Expired
Application number
GB5271/46A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
PEL HARRY ELIAS CLAESSON
Original Assignee
PEL HARRY ELIAS CLAESSON
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
Application filed by PEL HARRY ELIAS CLAESSON filed Critical PEL HARRY ELIAS CLAESSON
Publication of GB643973A publication Critical patent/GB643973A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/001—Two-way communication systems between a limited number of parties
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/0008—Selecting arrangements using relay selectors in the switching stages
    • H04Q3/0012—Selecting arrangements using relay selectors in the switching stages in which the relays are arranged in a matrix configuration

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Telephone Set Structure (AREA)
  • Push-Button Switches (AREA)

Abstract

643,973. Switch contacts. FREESE, H., and CLAESSON, P. H. E. Feb. 20, 1946, No. 5271. Convention date, Feb. 20, 1945. [Class 38(v)] [Also in Groups XXXVIII, XXXIX and XL(b)] A spring for use in a push button spring set for use in a telephone system (see Group XXXIX) has two flexible portions carrying contacts 14, 15 which may be respectively actuated by two separate push buttons. In a spring assembly in which some springs are required to be actuated by one or other of the buttons only, the flexible' portions carrying contacts not required to be operated by a particular push button are cut off.
GB5271/46A 1945-02-20 1946-02-20 Improvements in or relating to private telephone exchange systems Expired GB643973A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE283934X 1945-02-20

Publications (1)

Publication Number Publication Date
GB643973A true GB643973A (en) 1950-10-04

Family

ID=20307080

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5271/46A Expired GB643973A (en) 1945-02-20 1946-02-20 Improvements in or relating to private telephone exchange systems

Country Status (3)

Country Link
BE (1) BE478498A (en)
CH (1) CH283934A (en)
GB (1) GB643973A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE937651C (en) * 1952-08-31 1956-01-12 Siemens Ag Telecommunication, in particular telephone system with dialer operation
DE972172C (en) * 1953-05-16 1959-06-04 Normalzeit G M B H Circuit arrangement for telephone systems with a power surge transmission device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE937651C (en) * 1952-08-31 1956-01-12 Siemens Ag Telecommunication, in particular telephone system with dialer operation
DE972172C (en) * 1953-05-16 1959-06-04 Normalzeit G M B H Circuit arrangement for telephone systems with a power surge transmission device

Also Published As

Publication number Publication date
BE478498A (en)
CH283934A (en) 1952-06-30

Similar Documents

Publication Publication Date Title
GB961147A (en) Improvements in pressure-responsive switches
GB550797A (en) Push-pull electric switch
GB729266A (en) Improvements in and relating to electric push-button switches of the snap action type
GB643973A (en) Improvements in or relating to private telephone exchange systems
GB1479026A (en) Push button switch
GB696816A (en) Improvements in or relating to snap-action electric switches
ES222711A1 (en) Electrical switch
GB781553A (en) Coordinate switching unit
GB890236A (en) Improvements in or relating to cross-bar switches
GB875203A (en) Push button electric switch
GB931341A (en) Improvements in or relating to electric switches
GB921231A (en) Switch-operating push-buttons
GB860865A (en) Radio rescue apparatus
GB1026125A (en) Improvements in or relating to snap action mechanism for electric switches
GB1067318A (en) Pushbutton selective stop mechanism
GB915204A (en) Devices for transforming information supplied at one station to an indication of different information at another station
GB767008A (en) Improvements in or relating to dolly-actuated electric switches for a.c. circuits
GB1030054A (en) Improvements relating to electric switches
GB644848A (en) Electromagnetic switches
GB641283A (en) Improvements in and relating to snap-action electric switches
GB571196A (en) Improvements in electric switches
GB905319A (en) Improvements relating to electric switches
JPS5275248A (en) Diode switch
GB638181A (en) Improvements relating to lever operated electric switches for alternating current circuits
GB666977A (en) Improvements in or relating to signalling devices for use on road vehicles