KR890018330U - 전화기용 무단통화 방지장치 - Google Patents

전화기용 무단통화 방지장치

Info

Publication number
KR890018330U
KR890018330U KR2019880001487U KR880001487U KR890018330U KR 890018330 U KR890018330 U KR 890018330U KR 2019880001487 U KR2019880001487 U KR 2019880001487U KR 880001487 U KR880001487 U KR 880001487U KR 890018330 U KR890018330 U KR 890018330U
Authority
KR
South Korea
Prior art keywords
protection device
phone protection
phone
protection
Prior art date
Application number
KR2019880001487U
Other languages
English (en)
Other versions
KR900010133Y1 (ko
Inventor
정학병
Original Assignee
정학병
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 정학병 filed Critical 정학병
Priority to KR2019880001487U priority Critical patent/KR900010133Y1/ko
Publication of KR890018330U publication Critical patent/KR890018330U/ko
Application granted granted Critical
Publication of KR900010133Y1 publication Critical patent/KR900010133Y1/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
    • H04M1/667—Preventing unauthorised calls from a telephone set
    • H04M1/67—Preventing unauthorised calls from a telephone set by electronic means
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M2201/00—Electronic components, circuits, software, systems or apparatus used in telephone systems
    • H04M2201/02—Diodes

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Signal Processing (AREA)
  • Prepayment Telephone Systems (AREA)
KR2019880001487U 1988-02-09 1988-02-09 전화기용 무단통화 방지장치 KR900010133Y1 (ko)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR2019880001487U KR900010133Y1 (ko) 1988-02-09 1988-02-09 전화기용 무단통화 방지장치

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR2019880001487U KR900010133Y1 (ko) 1988-02-09 1988-02-09 전화기용 무단통화 방지장치

Publications (2)

Publication Number Publication Date
KR890018330U true KR890018330U (ko) 1989-09-09
KR900010133Y1 KR900010133Y1 (ko) 1990-10-31

Family

ID=19272210

Family Applications (1)

Application Number Title Priority Date Filing Date
KR2019880001487U KR900010133Y1 (ko) 1988-02-09 1988-02-09 전화기용 무단통화 방지장치

Country Status (1)

Country Link
KR (1) KR900010133Y1 (ko)

Also Published As

Publication number Publication date
KR900010133Y1 (ko) 1990-10-31

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Legal Events

Date Code Title Description
A201 Request for examination
E701 Decision to grant or registration of patent right
NORF Unpaid initial registration fee