KR850002234U - Intercity unauthorized call protection circuit - Google Patents

Intercity unauthorized call protection circuit

Info

Publication number
KR850002234U
KR850002234U KR2019830006631U KR830006631U KR850002234U KR 850002234 U KR850002234 U KR 850002234U KR 2019830006631 U KR2019830006631 U KR 2019830006631U KR 830006631 U KR830006631 U KR 830006631U KR 850002234 U KR850002234 U KR 850002234U
Authority
KR
South Korea
Prior art keywords
intercity
protection circuit
call protection
unauthorized call
unauthorized
Prior art date
Application number
KR2019830006631U
Other languages
Korean (ko)
Other versions
KR850001785Y1 (en
Inventor
원영택
Original Assignee
동양정밀공업주식회사
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 동양정밀공업주식회사 filed Critical 동양정밀공업주식회사
Priority to KR2019830006631U priority Critical patent/KR850001785Y1/en
Publication of KR850002234U publication Critical patent/KR850002234U/en
Application granted granted Critical
Publication of KR850001785Y1 publication Critical patent/KR850001785Y1/en

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
    • H04M1/667—Preventing unauthorised calls from a telephone set

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Signal Processing (AREA)
  • Interface Circuits In Exchanges (AREA)
KR2019830006631U 1983-07-28 1983-07-28 Toll line with means for preventing unauthorized calling KR850001785Y1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR2019830006631U KR850001785Y1 (en) 1983-07-28 1983-07-28 Toll line with means for preventing unauthorized calling

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR2019830006631U KR850001785Y1 (en) 1983-07-28 1983-07-28 Toll line with means for preventing unauthorized calling

Publications (2)

Publication Number Publication Date
KR850002234U true KR850002234U (en) 1985-04-22
KR850001785Y1 KR850001785Y1 (en) 1985-08-19

Family

ID=70158649

Family Applications (1)

Application Number Title Priority Date Filing Date
KR2019830006631U KR850001785Y1 (en) 1983-07-28 1983-07-28 Toll line with means for preventing unauthorized calling

Country Status (1)

Country Link
KR (1) KR850001785Y1 (en)

Also Published As

Publication number Publication date
KR850001785Y1 (en) 1985-08-19

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Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
E902 Notification of reason for refusal
E701 Decision to grant or registration of patent right
REGI Registration of establishment
FPAY Annual fee payment

Payment date: 19930816

Year of fee payment: 9

LAPS Lapse due to unpaid annual fee