JPS6322513B2 - - Google Patents

Info

Publication number
JPS6322513B2
JPS6322513B2 JP6408580A JP6408580A JPS6322513B2 JP S6322513 B2 JPS6322513 B2 JP S6322513B2 JP 6408580 A JP6408580 A JP 6408580A JP 6408580 A JP6408580 A JP 6408580A JP S6322513 B2 JPS6322513 B2 JP S6322513B2
Authority
JP
Japan
Prior art keywords
line
telephone
call
extension
circuit
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.)
Expired
Application number
JP6408580A
Other languages
English (en)
Japanese (ja)
Other versions
JPS56161754A (en
Inventor
Takeo Ooba
Eiji Morikami
Hirozo Shintani
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.)
Iwasaki Tsushinki KK
Original Assignee
Iwasaki Tsushinki 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 Iwasaki Tsushinki KK filed Critical Iwasaki Tsushinki KK
Priority to JP6408580A priority Critical patent/JPS56161754A/ja
Publication of JPS56161754A publication Critical patent/JPS56161754A/ja
Publication of JPS6322513B2 publication Critical patent/JPS6322513B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/02—Telephonic communication systems specially adapted for combination with other electrical systems with bell or annunciator systems
    • H04M11/025—Door telephones

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
JP6408580A 1980-05-16 1980-05-16 Door phone call system for key telephone set Granted JPS56161754A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6408580A JPS56161754A (en) 1980-05-16 1980-05-16 Door phone call system for key telephone set

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6408580A JPS56161754A (en) 1980-05-16 1980-05-16 Door phone call system for key telephone set

Publications (2)

Publication Number Publication Date
JPS56161754A JPS56161754A (en) 1981-12-12
JPS6322513B2 true JPS6322513B2 (en]) 1988-05-12

Family

ID=13247883

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6408580A Granted JPS56161754A (en) 1980-05-16 1980-05-16 Door phone call system for key telephone set

Country Status (1)

Country Link
JP (1) JPS56161754A (en])

Also Published As

Publication number Publication date
JPS56161754A (en) 1981-12-12

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