JPS5440403B2 - - Google Patents

Info

Publication number
JPS5440403B2
JPS5440403B2 JP15672475A JP15672475A JPS5440403B2 JP S5440403 B2 JPS5440403 B2 JP S5440403B2 JP 15672475 A JP15672475 A JP 15672475A JP 15672475 A JP15672475 A JP 15672475A JP S5440403 B2 JPS5440403 B2 JP S5440403B2
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
JP15672475A
Other languages
Japanese (ja)
Other versions
JPS5279705A (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 JP15672475A priority Critical patent/JPS5279705A/ja
Publication of JPS5279705A publication Critical patent/JPS5279705A/ja
Priority to US05/967,017 priority patent/US4254306A/en
Publication of JPS5440403B2 publication Critical patent/JPS5440403B2/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)
JP15672475A 1975-12-26 1975-12-26 Privacy circuit in key telephone unit Granted JPS5279705A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP15672475A JPS5279705A (en) 1975-12-26 1975-12-26 Privacy circuit in key telephone unit
US05/967,017 US4254306A (en) 1975-12-26 1978-12-06 Key telephone system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15672475A JPS5279705A (en) 1975-12-26 1975-12-26 Privacy circuit in key telephone unit

Publications (2)

Publication Number Publication Date
JPS5279705A JPS5279705A (en) 1977-07-05
JPS5440403B2 true JPS5440403B2 (enrdf_load_stackoverflow) 1979-12-03

Family

ID=15633935

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15672475A Granted JPS5279705A (en) 1975-12-26 1975-12-26 Privacy circuit in key telephone unit

Country Status (1)

Country Link
JP (1) JPS5279705A (enrdf_load_stackoverflow)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52104008A (en) * 1976-02-27 1977-09-01 Taiko Denki Seisakusho:Kk Connecting method of button telephone apparatus

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4926241A (enrdf_load_stackoverflow) * 1972-07-12 1974-03-08
JPS539803B2 (enrdf_load_stackoverflow) * 1973-01-13 1978-04-08

Also Published As

Publication number Publication date
JPS5279705A (en) 1977-07-05

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