JPS5379411A - Privacy call device - Google Patents

Privacy call device

Info

Publication number
JPS5379411A
JPS5379411A JP15582876A JP15582876A JPS5379411A JP S5379411 A JPS5379411 A JP S5379411A JP 15582876 A JP15582876 A JP 15582876A JP 15582876 A JP15582876 A JP 15582876A JP S5379411 A JPS5379411 A JP S5379411A
Authority
JP
Japan
Prior art keywords
circuit
call device
call
privacy call
time
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.)
Granted
Application number
JP15582876A
Other languages
English (en)
Japanese (ja)
Other versions
JPS558860B2 (OSRAM
Inventor
Minoru Shogase
Toshio Takara
Katsusuke Murota
Takeo Kishi
Toyoji Matsuda
Shizuo Hayashi
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.)
HASEGAWA DENKI SEISAKUSHO KK
Fujitsu Ltd
Original Assignee
HASEGAWA DENKI SEISAKUSHO KK
Fujitsu 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 HASEGAWA DENKI SEISAKUSHO KK, Fujitsu Ltd filed Critical HASEGAWA DENKI SEISAKUSHO KK
Priority to JP15582876A priority Critical patent/JPS5379411A/ja
Publication of JPS5379411A publication Critical patent/JPS5379411A/ja
Publication of JPS558860B2 publication Critical patent/JPS558860B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/68—Circuit arrangements for preventing eavesdropping
    • H04M1/70—Lock-out or secrecy arrangements in party-line systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
JP15582876A 1976-12-24 1976-12-24 Privacy call device Granted JPS5379411A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15582876A JPS5379411A (en) 1976-12-24 1976-12-24 Privacy call device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15582876A JPS5379411A (en) 1976-12-24 1976-12-24 Privacy call device

Publications (2)

Publication Number Publication Date
JPS5379411A true JPS5379411A (en) 1978-07-13
JPS558860B2 JPS558860B2 (OSRAM) 1980-03-06

Family

ID=15614372

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15582876A Granted JPS5379411A (en) 1976-12-24 1976-12-24 Privacy call device

Country Status (1)

Country Link
JP (1) JPS5379411A (OSRAM)

Also Published As

Publication number Publication date
JPS558860B2 (OSRAM) 1980-03-06

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