JPS52139306A - Calling system for key telephone equipment - Google Patents

Calling system for key telephone equipment

Info

Publication number
JPS52139306A
JPS52139306A JP5531976A JP5531976A JPS52139306A JP S52139306 A JPS52139306 A JP S52139306A JP 5531976 A JP5531976 A JP 5531976A JP 5531976 A JP5531976 A JP 5531976A JP S52139306 A JPS52139306 A JP S52139306A
Authority
JP
Japan
Prior art keywords
key telephone
calling system
telephone equipment
calling
economization
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
JP5531976A
Other languages
English (en)
Japanese (ja)
Other versions
JPS5543663B2 (OSRAM
Inventor
Koichi Sekiguchi
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 JP5531976A priority Critical patent/JPS52139306A/ja
Publication of JPS52139306A publication Critical patent/JPS52139306A/ja
Priority to US06/066,927 priority patent/US4410767A/en
Publication of JPS5543663B2 publication Critical patent/JPS5543663B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Sub-Exchange Stations And Push- Button Telephones (AREA)
JP5531976A 1976-05-17 1976-05-17 Calling system for key telephone equipment Granted JPS52139306A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP5531976A JPS52139306A (en) 1976-05-17 1976-05-17 Calling system for key telephone equipment
US06/066,927 US4410767A (en) 1976-05-17 1979-08-16 Key telephone system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5531976A JPS52139306A (en) 1976-05-17 1976-05-17 Calling system for key telephone equipment

Publications (2)

Publication Number Publication Date
JPS52139306A true JPS52139306A (en) 1977-11-21
JPS5543663B2 JPS5543663B2 (OSRAM) 1980-11-07

Family

ID=12995218

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5531976A Granted JPS52139306A (en) 1976-05-17 1976-05-17 Calling system for key telephone equipment

Country Status (1)

Country Link
JP (1) JPS52139306A (OSRAM)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53116707A (en) * 1977-03-22 1978-10-12 Tamura Electric Works Ltd Button telephone set

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5213706A (en) * 1975-07-23 1977-02-02 Kanda Tsushin Kogyo Kk Key telephone system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5213706A (en) * 1975-07-23 1977-02-02 Kanda Tsushin Kogyo Kk Key telephone system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53116707A (en) * 1977-03-22 1978-10-12 Tamura Electric Works Ltd Button telephone set

Also Published As

Publication number Publication date
JPS5543663B2 (OSRAM) 1980-11-07

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