YU34072B - Selector dial switch contact controlled electronic circuitfor blocking and for free dialing of single or several characteristic numbers especially for coin-operated telephone apparatus - Google Patents

Selector dial switch contact controlled electronic circuitfor blocking and for free dialing of single or several characteristic numbers especially for coin-operated telephone apparatus

Info

Publication number
YU34072B
YU34072B YU21172A YU21172A YU34072B YU 34072 B YU34072 B YU 34072B YU 21172 A YU21172 A YU 21172A YU 21172 A YU21172 A YU 21172A YU 34072 B YU34072 B YU 34072B
Authority
YU
Yugoslavia
Prior art keywords
circuitfor
coin
blocking
switch contact
telephone apparatus
Prior art date
Application number
YU21172A
Other languages
English (en)
Other versions
YU21172A (en
Inventor
Richter Wilfred
Wilfred Richter
Original Assignee
Nordhausen Veb Fernmeldewerk
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 Nordhausen Veb Fernmeldewerk filed Critical Nordhausen Veb Fernmeldewerk
Publication of YU21172A publication Critical patent/YU21172A/xx
Publication of YU34072B publication Critical patent/YU34072B/xx

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/66—Substation equipment, e.g. for use by subscribers with means for preventing unauthorised or fraudulent calling
    • H04M1/677—Preventing the dialling or sending of predetermined telephone numbers or selected types of telephone numbers, e.g. long distance numbers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Computer Security & Cryptography (AREA)
  • Signal Processing (AREA)
  • Prepayment Telephone Systems (AREA)
YU21172A 1971-02-01 1972-01-31 Selector dial switch contact controlled electronic circuitfor blocking and for free dialing of single or several characteristic numbers especially for coin-operated telephone apparatus YU34072B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DD15279971 1971-02-01

Publications (2)

Publication Number Publication Date
YU21172A YU21172A (en) 1978-05-15
YU34072B true YU34072B (en) 1978-10-31

Family

ID=5483406

Family Applications (1)

Application Number Title Priority Date Filing Date
YU21172A YU34072B (en) 1971-02-01 1972-01-31 Selector dial switch contact controlled electronic circuitfor blocking and for free dialing of single or several characteristic numbers especially for coin-operated telephone apparatus

Country Status (4)

Country Link
CS (1) CS162117B1 (cs)
DE (1) DE2165235A1 (cs)
HU (1) HU165048B (cs)
YU (1) YU34072B (cs)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4336422A (en) * 1978-07-05 1982-06-22 Akzona Incorporated Toll restrictor

Also Published As

Publication number Publication date
HU165048B (cs) 1974-06-28
DE2165235A1 (de) 1972-11-23
YU21172A (en) 1978-05-15
CS162117B1 (en) 1975-07-15

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