JPS5213707A - Privacy system in key telephone system - Google Patents

Privacy system in key telephone system

Info

Publication number
JPS5213707A
JPS5213707A JP8967375A JP8967375A JPS5213707A JP S5213707 A JPS5213707 A JP S5213707A JP 8967375 A JP8967375 A JP 8967375A JP 8967375 A JP8967375 A JP 8967375A JP S5213707 A JPS5213707 A JP S5213707A
Authority
JP
Japan
Prior art keywords
system
key telephone
privacy
telephone system
privacy system
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.)
Pending
Application number
JP8967375A
Inventor
Minoru Sasai
Original Assignee
Kanda Tsushin Kogyo Kk
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 Kanda Tsushin Kogyo Kk filed Critical Kanda Tsushin Kogyo Kk
Priority to JP8967375A priority Critical patent/JPS5213707A/en
Priority claimed from US05/707,324 external-priority patent/US4079212A/en
Publication of JPS5213707A publication Critical patent/JPS5213707A/en
Application status is Pending legal-status Critical

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M1/00Substation equipment, e.g. for use by subscribers; Analogous equipment at exchanges
    • H04M1/68Circuit arrangements for preventing eavesdropping
    • H04M1/70Lock-out or secrecy arrangements in party-line systems

Abstract

PURPOSE:Reduce wirings as much as possible.
JP8967375A 1975-07-24 1975-07-24 Privacy system in key telephone system Pending JPS5213707A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8967375A JPS5213707A (en) 1975-07-24 1975-07-24 Privacy system in key telephone system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP8967375A JPS5213707A (en) 1975-07-24 1975-07-24 Privacy system in key telephone system
US05/707,324 US4079212A (en) 1975-07-23 1976-07-21 Extension telephone system

Publications (1)

Publication Number Publication Date
JPS5213707A true JPS5213707A (en) 1977-02-02

Family

ID=13977256

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8967375A Pending JPS5213707A (en) 1975-07-24 1975-07-24 Privacy system in key telephone system

Country Status (1)

Country Link
JP (1) JPS5213707A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE42635E1 (en) 2000-03-20 2011-08-23 Shimano, Inc. Cable disc brake

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE42635E1 (en) 2000-03-20 2011-08-23 Shimano, Inc. Cable disc brake

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