NL49979C - - Google Patents

Info

Publication number
NL49979C
NL49979C NL49979DA NL49979C NL 49979 C NL49979 C NL 49979C NL 49979D A NL49979D A NL 49979DA NL 49979 C NL49979 C NL 49979C
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 NL49979C publication Critical patent/NL49979C/xx

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J1/00—Frequency-division multiplex systems
    • H04J1/02—Details
    • H04J1/14—Arrangements providing for calling or supervisory signals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
    • H01C7/04—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material having negative temperature coefficient
    • 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
    • H04Q1/446—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency
    • H04Q1/4465—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency the same frequency being used for all signalling information, e.g. A.C. nr.9 system
NL49979D 1936-12-02 NL49979C (xx)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US113820A US2117843A (en) 1936-12-02 1936-12-02 Frequency selective circuits

Publications (1)

Publication Number Publication Date
NL49979C true NL49979C (xx)

Family

ID=22351700

Family Applications (1)

Application Number Title Priority Date Filing Date
NL49979D NL49979C (xx) 1936-12-02

Country Status (5)

Country Link
US (1) US2117843A (xx)
BE (1) BE424937A (xx)
CH (1) CH211212A (xx)
FR (1) FR830249A (xx)
NL (1) NL49979C (xx)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2694163A (en) * 1951-03-16 1954-11-09 Joseph G Sola Voltage sensitive apparatus
US2801290A (en) * 1951-09-17 1957-07-30 Telefunken Gmbh Calling signal responder arrangements

Also Published As

Publication number Publication date
BE424937A (xx)
FR830249A (fr) 1938-07-25
US2117843A (en) 1938-05-17
CH211212A (de) 1940-08-31

Similar Documents

Publication Publication Date Title
BE415900A (xx)
BE416111A (xx)
BE414636A (xx)
BE406332A (xx)
BE413309A (xx)
BE413384A (xx)
BE413397A (xx)
BE413408A (xx)
BE413460A (xx)
BE413631A (xx)
BE413706A (xx)
BE413759A (xx)
BE413893A (xx)
BE414076A (xx)
BE414157A (xx)
BE414357A (xx)
BE414370A (xx)
BE414373A (xx)
BE414472A (xx)
BE414511A (xx)
BE414571A (xx)
BE416271A (xx)
BE414645A (xx)
BE414653A (xx)
BE414686A (xx)