JPS5283003A - Privacy system for key telephone set - Google Patents

Privacy system for key telephone set

Info

Publication number
JPS5283003A
JPS5283003A JP15833775A JP15833775A JPS5283003A JP S5283003 A JPS5283003 A JP S5283003A JP 15833775 A JP15833775 A JP 15833775A JP 15833775 A JP15833775 A JP 15833775A JP S5283003 A JPS5283003 A JP S5283003A
Authority
JP
Japan
Prior art keywords
telephone set
key telephone
privacy system
privacy
key
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
JP15833775A
Other languages
English (en)
Inventor
Toshiji Kinoshita
Yoshio Shinoda
Takashi Oyamada
Mitsuo Masuda
Noritomo Arai
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.)
Tamura Electric Works Ltd
Original Assignee
Tamura Electric Works 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 Tamura Electric Works Ltd filed Critical Tamura Electric Works Ltd
Priority to JP15833775A priority Critical patent/JPS5283003A/ja
Priority to US05/711,975 priority patent/US4125749A/en
Publication of JPS5283003A publication Critical patent/JPS5283003A/ja
Pending legal-status Critical Current

Links

JP15833775A 1975-08-09 1975-12-30 Privacy system for key telephone set Pending JPS5283003A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP15833775A JPS5283003A (en) 1975-12-30 1975-12-30 Privacy system for key telephone set
US05/711,975 US4125749A (en) 1975-08-09 1976-08-05 Key telephone systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15833775A JPS5283003A (en) 1975-12-30 1975-12-30 Privacy system for key telephone set

Publications (1)

Publication Number Publication Date
JPS5283003A true JPS5283003A (en) 1977-07-11

Family

ID=15669420

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15833775A Pending JPS5283003A (en) 1975-08-09 1975-12-30 Privacy system for key telephone set

Country Status (1)

Country Link
JP (1) JPS5283003A (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5099515A (en) * 1989-09-19 1992-03-24 Kabushiki Kaisha Nippon Conlux Secrecy device for wiretapping prevention and detection

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4875105A (ja) * 1972-01-11 1973-10-09
JPS4953706A (ja) * 1972-09-28 1974-05-24

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4875105A (ja) * 1972-01-11 1973-10-09
JPS4953706A (ja) * 1972-09-28 1974-05-24

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5099515A (en) * 1989-09-19 1992-03-24 Kabushiki Kaisha Nippon Conlux Secrecy device for wiretapping prevention and detection

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