KR870003072U - 장거리 자동통화(ddd)방지 장치 - Google Patents

장거리 자동통화(ddd)방지 장치

Info

Publication number
KR870003072U
KR870003072U KR2019850008313U KR850008313U KR870003072U KR 870003072 U KR870003072 U KR 870003072U KR 2019850008313 U KR2019850008313 U KR 2019850008313U KR 850008313 U KR850008313 U KR 850008313U KR 870003072 U KR870003072 U KR 870003072U
Authority
KR
South Korea
Prior art keywords
ddd
long
prevention device
automatic call
distance automatic
Prior art date
Application number
KR2019850008313U
Other languages
English (en)
Other versions
KR880001216Y1 (ko
Inventor
이호상
Original Assignee
이호상
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 이호상 filed Critical 이호상
Priority to KR2019850008313U priority Critical patent/KR880001216Y1/ko
Publication of KR870003072U publication Critical patent/KR870003072U/ko
Application granted granted Critical
Publication of KR880001216Y1 publication Critical patent/KR880001216Y1/ko

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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Signal Processing (AREA)
  • Telephone Set Structure (AREA)
KR2019850008313U 1985-07-05 1985-07-05 장거리 자동통화(ddd)방지 장치 KR880001216Y1 (ko)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR2019850008313U KR880001216Y1 (ko) 1985-07-05 1985-07-05 장거리 자동통화(ddd)방지 장치

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR2019850008313U KR880001216Y1 (ko) 1985-07-05 1985-07-05 장거리 자동통화(ddd)방지 장치

Publications (2)

Publication Number Publication Date
KR870003072U true KR870003072U (ko) 1987-03-19
KR880001216Y1 KR880001216Y1 (ko) 1988-03-30

Family

ID=19243557

Family Applications (1)

Application Number Title Priority Date Filing Date
KR2019850008313U KR880001216Y1 (ko) 1985-07-05 1985-07-05 장거리 자동통화(ddd)방지 장치

Country Status (1)

Country Link
KR (1) KR880001216Y1 (ko)

Also Published As

Publication number Publication date
KR880001216Y1 (ko) 1988-03-30

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Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
E701 Decision to grant or registration of patent right
REGI Registration of establishment
LAPS Lapse due to unpaid annual fee