CH230160A - Circuit arrangement for telephone exchange systems. - Google Patents

Circuit arrangement for telephone exchange systems.

Info

Publication number
CH230160A
CH230160A CH230160DA CH230160A CH 230160 A CH230160 A CH 230160A CH 230160D A CH230160D A CH 230160DA CH 230160 A CH230160 A CH 230160A
Authority
CH
Switzerland
Prior art keywords
circuit arrangement
telephone exchange
exchange systems
systems
telephone
Prior art date
Application number
Other languages
German (de)
Inventor
Bell Telephone Manufac Anonyme
Original Assignee
Bell Telephone Mfg
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 Bell Telephone Mfg filed Critical Bell Telephone Mfg
Publication of CH230160A publication Critical patent/CH230160A/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
    • H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
    • H04Q1/45—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Telephonic Communication Services (AREA)
CH230160D 1936-08-14 1937-08-14 Circuit arrangement for telephone exchange systems. CH230160A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB230160X 1936-08-14

Publications (1)

Publication Number Publication Date
CH230160A true CH230160A (en) 1943-12-15

Family

ID=10188719

Family Applications (1)

Application Number Title Priority Date Filing Date
CH230160D CH230160A (en) 1936-08-14 1937-08-14 Circuit arrangement for telephone exchange systems.

Country Status (5)

Country Link
BE (1) BE422659A (en)
CH (1) CH230160A (en)
FR (1) FR825569A (en)
GB (1) GB479881A (en)
NL (1) NL49757C (en)

Also Published As

Publication number Publication date
FR825569A (en) 1938-03-07
BE422659A (en)
GB479881A (en) 1938-02-14
NL49757C (en)

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