NL81161C - - Google Patents

Info

Publication number
NL81161C
NL81161C NL81161DA NL81161C NL 81161 C NL81161 C NL 81161C NL 81161D A NL81161D A NL 81161DA NL 81161 C NL81161 C NL 81161C
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 NL81161C publication Critical patent/NL81161C/xx

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/26—Devices for calling a subscriber
    • H04M1/30—Devices which can set up and transmit only one digit at a time
    • H04M1/50—Devices which can set up and transmit only one digit at a time by generating or selecting currents of predetermined frequencies or combinations of frequencies
    • 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
    • H04Q1/453—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling in which m-out-of-n signalling frequencies are transmitted
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Selective Calling Equipment (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)
  • Alarm Systems (AREA)
  • Exchange Systems With Centralized Control (AREA)
NL81161D 1950-07-21 NL81161C (ja)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE691237X 1950-07-21

Publications (1)

Publication Number Publication Date
NL81161C true NL81161C (ja)

Family

ID=20315203

Family Applications (2)

Application Number Title Priority Date Filing Date
NL7003296.A NL162796B (nl) 1950-07-21 Waterdicht stopcontact.
NL81161D NL81161C (ja) 1950-07-21

Family Applications Before (1)

Application Number Title Priority Date Filing Date
NL7003296.A NL162796B (nl) 1950-07-21 Waterdicht stopcontact.

Country Status (4)

Country Link
US (1) US2706746A (ja)
DE (1) DE886929C (ja)
GB (1) GB691237A (ja)
NL (2) NL81161C (ja)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1001713B (de) * 1953-12-07 1957-01-31 Telefonbau & Normalzeit Gmbh Telefonteilnehmerstation mit tastengesteuerter Frequenzwahl und einem Schichttransistoren enthaltenden Mikrophonverstaerker
NL201110A (ja) * 1954-10-25
DE1085201B (de) * 1955-01-19 1960-07-14 Josef Dirr Schaltungsanordnung zur Auswertung von ueber abgeriegelte Leitungen uebertragenen, zeitlich versetzten Wechselstromimpulsen einer Frequenz fuer die Identifizierung von Leitungen zur Gebuehrenerfassung in Fernmelde-, insbesondere Fernsprechanlagen
DE1017661B (de) * 1956-01-30 1957-10-17 Telefonbau & Normalzeit Gmbh Einrichtung zur Nummernsendung in Form codifizierter Signale in Fernsprechapparaten
DE1039107B (de) * 1956-06-28 1958-09-18 Standard Elektrik Lorenz Ag Schaltungsanordnung fuer elektrische, ueber Fernleitungen an eine Zentralbatterie angeschlossene Einrichtungen
US3076059A (en) * 1958-06-20 1963-01-29 Bell Telephone Labor Inc Signaling system
CH379584A (de) * 1958-09-03 1964-07-15 Standard Telephon & Radio Ag Elektrische Signalisier-Einrichtung
DE1090273B (de) * 1959-05-09 1960-10-06 Philips Nv Schaltungsanordnung zur Auswertung von Signalen verschiedener Frequenzen in Fernmeldeanlagen
DE1082300B (de) * 1959-06-04 1960-05-25 Siemens Ag Schaltungsanordnung fuer Teilnehmerstellen in Fernmelde-, insbesondere Fernsprech-anlagen mit Tastaturwahl
NL255940A (ja) * 1959-10-02
DE1152447B (de) * 1960-03-10 1963-08-08 Neumann Elektronik Gmbh Wechsel-Lautsprechanlage mit tongesteuerten Verbindungswegen

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2250100A (en) * 1939-11-14 1941-07-22 Bell Telephone Labor Inc Signaling system
US2554201A (en) * 1946-06-19 1951-05-22 Ericsson Telefon Ab L M Key-sending automatic telephone signaling system

Also Published As

Publication number Publication date
DE886929C (de) 1953-08-20
GB691237A (en) 1953-05-06
NL162796B (nl)
US2706746A (en) 1955-04-19

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