JPS5536223B2 - - Google Patents

Info

Publication number
JPS5536223B2
JPS5536223B2 JP14960976A JP14960976A JPS5536223B2 JP S5536223 B2 JPS5536223 B2 JP S5536223B2 JP 14960976 A JP14960976 A JP 14960976A JP 14960976 A JP14960976 A JP 14960976A JP S5536223 B2 JPS5536223 B2 JP S5536223B2
Authority
JP
Japan
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
JP14960976A
Other languages
Japanese (ja)
Other versions
JPS5373009A (en
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 filed Critical
Priority to JP14960976A priority Critical patent/JPS5373009A/en
Publication of JPS5373009A publication Critical patent/JPS5373009A/en
Publication of JPS5536223B2 publication Critical patent/JPS5536223B2/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)
JP14960976A 1976-12-13 1976-12-13 Privacy call circuit of button telephone device Granted JPS5373009A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14960976A JPS5373009A (en) 1976-12-13 1976-12-13 Privacy call circuit of button telephone device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14960976A JPS5373009A (en) 1976-12-13 1976-12-13 Privacy call circuit of button telephone device

Publications (2)

Publication Number Publication Date
JPS5373009A JPS5373009A (en) 1978-06-29
JPS5536223B2 true JPS5536223B2 (en) 1980-09-19

Family

ID=15478937

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14960976A Granted JPS5373009A (en) 1976-12-13 1976-12-13 Privacy call circuit of button telephone device

Country Status (1)

Country Link
JP (1) JPS5373009A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61220552A (en) * 1985-03-26 1986-09-30 Nec Corp Privacy system

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4996604A (en) * 1973-01-13 1974-09-12

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4996604A (en) * 1973-01-13 1974-09-12

Also Published As

Publication number Publication date
JPS5373009A (en) 1978-06-29

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