KR900005857U - Automatic switching circuit of telephone line in case of emergency - Google Patents

Automatic switching circuit of telephone line in case of emergency

Info

Publication number
KR900005857U
KR900005857U KR2019880013441U KR880013441U KR900005857U KR 900005857 U KR900005857 U KR 900005857U KR 2019880013441 U KR2019880013441 U KR 2019880013441U KR 880013441 U KR880013441 U KR 880013441U KR 900005857 U KR900005857 U KR 900005857U
Authority
KR
South Korea
Prior art keywords
emergency
case
switching circuit
telephone line
automatic switching
Prior art date
Application number
KR2019880013441U
Other languages
Korean (ko)
Other versions
KR940004498Y1 (en
Inventor
허근철
Original Assignee
금성통신 주식회사
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 금성통신 주식회사 filed Critical 금성통신 주식회사
Priority to KR2019880013441U priority Critical patent/KR940004498Y1/en
Publication of KR900005857U publication Critical patent/KR900005857U/en
Application granted granted Critical
Publication of KR940004498Y1 publication Critical patent/KR940004498Y1/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/42—Systems providing special services or facilities to subscribers
    • H04M3/54—Arrangements for diverting calls for one subscriber to another predetermined subscriber

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Alarm Systems (AREA)
KR2019880013441U 1988-08-17 1988-08-17 Automatic switching circuit on emergency KR940004498Y1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR2019880013441U KR940004498Y1 (en) 1988-08-17 1988-08-17 Automatic switching circuit on emergency

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR2019880013441U KR940004498Y1 (en) 1988-08-17 1988-08-17 Automatic switching circuit on emergency

Publications (2)

Publication Number Publication Date
KR900005857U true KR900005857U (en) 1990-03-09
KR940004498Y1 KR940004498Y1 (en) 1994-07-04

Family

ID=19278503

Family Applications (1)

Application Number Title Priority Date Filing Date
KR2019880013441U KR940004498Y1 (en) 1988-08-17 1988-08-17 Automatic switching circuit on emergency

Country Status (1)

Country Link
KR (1) KR940004498Y1 (en)

Also Published As

Publication number Publication date
KR940004498Y1 (en) 1994-07-04

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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
FPAY Annual fee payment

Payment date: 19990316

Year of fee payment: 6

LAPS Lapse due to unpaid annual fee