CH258725A - Ferneinschaltbarer Selbstanschluss-Fernsprecher für lautstarken Verkehr. - Google Patents

Ferneinschaltbarer Selbstanschluss-Fernsprecher für lautstarken Verkehr.

Info

Publication number
CH258725A
CH258725A CH258725DA CH258725A CH 258725 A CH258725 A CH 258725A CH 258725D A CH258725D A CH 258725DA CH 258725 A CH258725 A CH 258725A
Authority
CH
Switzerland
Prior art keywords
connection telephone
noisy
switchable self
traffic
remote switchable
Prior art date
Application number
Other languages
English (en)
Inventor
Aktiengesellschaft Autophon
Original Assignee
Autophon Ag
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 Autophon Ag filed Critical Autophon Ag
Publication of CH258725A publication Critical patent/CH258725A/de

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
    • H04M1/6033—Substation equipment, e.g. for use by subscribers including speech amplifiers for providing handsfree use or a loudspeaker mode in telephone sets

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Interface Circuits In Exchanges (AREA)
CH258725D 1942-12-21 1942-12-21 Ferneinschaltbarer Selbstanschluss-Fernsprecher für lautstarken Verkehr. CH258725A (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH597893X 1942-12-21

Publications (1)

Publication Number Publication Date
CH258725A true CH258725A (de) 1948-12-15

Family

ID=4522563

Family Applications (1)

Application Number Title Priority Date Filing Date
CH258725D CH258725A (de) 1942-12-21 1942-12-21 Ferneinschaltbarer Selbstanschluss-Fernsprecher für lautstarken Verkehr.

Country Status (3)

Country Link
US (1) US2470590A (de)
CH (1) CH258725A (de)
GB (1) GB597893A (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3215781A (en) * 1962-07-30 1965-11-02 Webster Electric Co Inc Intercommunication system
US6091812A (en) * 1996-11-12 2000-07-18 Siemens Information And Communication Networks, Inc. Apparatus and method for automatically switching a headset between a telephone and a second audio source

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1486868A (en) * 1920-05-27 1924-03-18 Western Electric Co Intercommunicating telephone system
US1647606A (en) * 1925-11-28 1927-11-01 J S Timmons Inc Intercommunication system
US2036023A (en) * 1933-06-09 1936-03-31 Bell Telephone Labor Inc Telephone system
FR789510A (fr) * 1933-12-30 1935-10-30 Le Telephone Prive Nat Perfectionnements à la téléphonie
US2146362A (en) * 1936-10-01 1939-02-07 Lcuis W Thomsen Two-way communication system
US2162370A (en) * 1937-07-19 1939-06-13 Webster Electric Co Inc Communication system
GB508031A (en) * 1937-12-23 1939-06-23 Automatic Telephone & Elect Improvements in or relating to telephone systems
GB522457A (en) * 1938-12-02 1940-06-18 Marcello Creti Improvements in or relating to systems of simultaneous telephony on a number of lines

Also Published As

Publication number Publication date
US2470590A (en) 1949-05-17
GB597893A (en) 1948-02-05

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