BE374880A - - Google Patents

Info

Publication number
BE374880A
BE374880A BE374880DA BE374880A BE 374880 A BE374880 A BE 374880A BE 374880D A BE374880D A BE 374880DA BE 374880 A BE374880 A BE 374880A
Authority
BE
Belgium
Prior art keywords
frequencies
electromagnets
circuit
electromagnet
desc
Prior art date
Application number
Other languages
English (en)
French (fr)
Publication of BE374880A publication Critical patent/BE374880A/fr

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B3/00—Audible signalling systems, e.g. audible personal calling systems
    • G08B3/10—Audible signalling systems, e.g. audible personal calling systems using electric transmission; using electromagnetic transmission

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Selective Calling Equipment (AREA)
BE374880D BE374880A (da)

Publications (1)

Publication Number Publication Date
BE374880A true BE374880A (da)

Family

ID=45571

Family Applications (1)

Application Number Title Priority Date Filing Date
BE374880D BE374880A (da)

Country Status (1)

Country Link
BE (1) BE374880A (da)

Similar Documents

Publication Publication Date Title
US2284173A (en) Apparatus for recording and reproducing telephone messages
US2221883A (en) Telephone answering system
US1947249A (en) Telephonic telegraphy
BE374880A (da)
US2082303A (en) Telephone system for recording and reproducing transmissions
EP0083893B1 (fr) Système de transmission de messages à un poste téléphonique par la ligne d'abonné dans une installation téléphonique
US1888904A (en) Station calling device
US2700067A (en) Apparatus for magnetically storing teleprinter signals
US2000694A (en) Television system
US1852877A (en) Talking machine
US2164038A (en) Facsimile transmission and reproduction
US1050777A (en) Phonographic wireless telephone.
US1920729A (en) Telephone message recording and reproducing apparatus
US2203877A (en) Telephone message recording and reproducing apparatus
US378436A (en) delany
US1895015A (en) Telegraph repeater
US510007A (en) Telegraphy
CH294527A (fr) Radiotéléphone.
GB508103A (en) Improvements in or relating to means for the transmission of telegrams over telephone wires
US355662A (en) Printing telegraph
US636209A (en) Telephonograph.
US717776A (en) Quadruplex telegraph system.
US1545708A (en) Transmission of pictures by electricity
US1653074A (en) Transmission of pictures by electricity
US2914607A (en) Facsimile phasing and repeating system