JPS56161754A - Door phone call system for key telephone set - Google Patents

Door phone call system for key telephone set

Info

Publication number
JPS56161754A
JPS56161754A JP6408580A JP6408580A JPS56161754A JP S56161754 A JPS56161754 A JP S56161754A JP 6408580 A JP6408580 A JP 6408580A JP 6408580 A JP6408580 A JP 6408580A JP S56161754 A JPS56161754 A JP S56161754A
Authority
JP
Japan
Prior art keywords
channel
telephone set
extension
door phone
contact
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
JP6408580A
Other languages
English (en)
Japanese (ja)
Other versions
JPS6322513B2 (enrdf_load_stackoverflow
Inventor
Takeo Oba
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.)
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 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 true JPS56161754A (en) 1981-12-12
JPS6322513B2 JPS6322513B2 (enrdf_load_stackoverflow) 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 (enrdf_load_stackoverflow)

Also Published As

Publication number Publication date
JPS6322513B2 (enrdf_load_stackoverflow) 1988-05-12

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