JPH0129119B2 - - Google Patents

Info

Publication number
JPH0129119B2
JPH0129119B2 JP7534981A JP7534981A JPH0129119B2 JP H0129119 B2 JPH0129119 B2 JP H0129119B2 JP 7534981 A JP7534981 A JP 7534981A JP 7534981 A JP7534981 A JP 7534981A JP H0129119 B2 JPH0129119 B2 JP H0129119B2
Authority
JP
Japan
Prior art keywords
circuit
line
extension
switch means
voltage
Prior art date
Legal status (The legal status 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 status listed.)
Expired
Application number
JP7534981A
Other languages
English (en)
Japanese (ja)
Other versions
JPS57190450A (en
Inventor
Seiichi Nakazawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Meisei Electric Co Ltd
Original Assignee
Meisei Electric Co Ltd
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 Meisei Electric Co Ltd filed Critical Meisei Electric Co Ltd
Priority to JP7534981A priority Critical patent/JPS57190450A/ja
Publication of JPS57190450A publication Critical patent/JPS57190450A/ja
Publication of JPH0129119B2 publication Critical patent/JPH0129119B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/002—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems
    • H04M9/005—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems with subscriber controlled access to an exchange line

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
JP7534981A 1981-05-19 1981-05-19 Privacy system for push-button dial telephone set Granted JPS57190450A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7534981A JPS57190450A (en) 1981-05-19 1981-05-19 Privacy system for push-button dial telephone set

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7534981A JPS57190450A (en) 1981-05-19 1981-05-19 Privacy system for push-button dial telephone set

Publications (2)

Publication Number Publication Date
JPS57190450A JPS57190450A (en) 1982-11-24
JPH0129119B2 true JPH0129119B2 (en]) 1989-06-07

Family

ID=13573672

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7534981A Granted JPS57190450A (en) 1981-05-19 1981-05-19 Privacy system for push-button dial telephone set

Country Status (1)

Country Link
JP (1) JPS57190450A (en])

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63217758A (ja) * 1987-03-05 1988-09-09 Nec Corp 分岐電話機

Also Published As

Publication number Publication date
JPS57190450A (en) 1982-11-24

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