NL86988C - - Google Patents

Info

Publication number
NL86988C
NL86988C NL86988DA NL86988C NL 86988 C NL86988 C NL 86988C NL 86988D A NL86988D A NL 86988DA NL 86988 C NL86988 C NL 86988C
Authority
NL
Netherlands
Application number
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.)
Publication of NL86988C publication Critical patent/NL86988C/xx
Priority claimed from DEM11828A external-priority patent/DE909949C/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M15/00—Arrangements for metering, time-control or time indication ; Metering, charging or billing arrangements for voice wireline or wireless communications, e.g. VoIP
    • H04M15/10—Metering calls from calling party, i.e. A-party charged for the communication
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F19/00—Fixed transformers or mutual inductances of the signal type
    • H01F19/02—Audio-frequency transformers or mutual inductances, i.e. not suitable for handling frequencies considerably beyond the audio range
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M7/00—Arrangements for interconnection between switching centres
    • H04M7/08—Arrangements for interconnection between switching centres for phantom working
    • 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
    • H04Q1/32—Signalling arrangements; Manipulation of signalling currents using trains of dc pulses

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Power Engineering (AREA)
  • Multimedia (AREA)
  • Filters And Equalizers (AREA)
NL86988D 1951-11-23 NL86988C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE1067021X 1951-11-23
DE2709721X 1951-11-23
DEM11828A DE909949C (en) 1951-11-24 1951-11-24 Circuit arrangement for telephone systems to compensate for direct current bias of the iron core of transmitters or chokes lying between the speech wires

Publications (1)

Publication Number Publication Date
NL86988C true NL86988C (en)

Family

ID=27211515

Family Applications (1)

Application Number Title Priority Date Filing Date
NL86988D NL86988C (en) 1951-11-23

Country Status (2)

Country Link
US (1) US2709721A (en)
NL (1) NL86988C (en)

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB598552A (en) * 1945-01-30 1948-02-20 Bertram Morton Hadfield Improvements in or relating to electrical signalling systems

Also Published As

Publication number Publication date
US2709721A (en) 1955-05-31

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