JPS5373010A - Privacy call circuit of buttom telephon device - Google Patents

Privacy call circuit of buttom telephon device

Info

Publication number
JPS5373010A
JPS5373010A JP14961076A JP14961076A JPS5373010A JP S5373010 A JPS5373010 A JP S5373010A JP 14961076 A JP14961076 A JP 14961076A JP 14961076 A JP14961076 A JP 14961076A JP S5373010 A JPS5373010 A JP S5373010A
Authority
JP
Japan
Prior art keywords
telephon
buttom
call circuit
privacy call
privacy
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
JP14961076A
Other languages
English (en)
Japanese (ja)
Other versions
JPS5536224B2 (enrdf_load_stackoverflow
Inventor
Koichi Sekiguchi
Juichi Takano
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.)
Iwatsu Electric Co Ltd
Original Assignee
Iwatsu 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 Iwatsu Electric Co Ltd filed Critical Iwatsu Electric Co Ltd
Priority to JP14961076A priority Critical patent/JPS5373010A/ja
Publication of JPS5373010A publication Critical patent/JPS5373010A/ja
Publication of JPS5536224B2 publication Critical patent/JPS5536224B2/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
JP14961076A 1976-12-13 1976-12-13 Privacy call circuit of buttom telephon device Granted JPS5373010A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14961076A JPS5373010A (en) 1976-12-13 1976-12-13 Privacy call circuit of buttom telephon device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14961076A JPS5373010A (en) 1976-12-13 1976-12-13 Privacy call circuit of buttom telephon device

Publications (2)

Publication Number Publication Date
JPS5373010A true JPS5373010A (en) 1978-06-29
JPS5536224B2 JPS5536224B2 (enrdf_load_stackoverflow) 1980-09-19

Family

ID=15478959

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14961076A Granted JPS5373010A (en) 1976-12-13 1976-12-13 Privacy call circuit of buttom telephon device

Country Status (1)

Country Link
JP (1) JPS5373010A (enrdf_load_stackoverflow)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS494962A (enrdf_load_stackoverflow) * 1972-04-27 1974-01-17
JPS4996604A (enrdf_load_stackoverflow) * 1973-01-13 1974-09-12

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS494962A (enrdf_load_stackoverflow) * 1972-04-27 1974-01-17
JPS4996604A (enrdf_load_stackoverflow) * 1973-01-13 1974-09-12

Also Published As

Publication number Publication date
JPS5536224B2 (enrdf_load_stackoverflow) 1980-09-19

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