JPS562776A - Door phone unit - Google Patents

Door phone unit

Info

Publication number
JPS562776A
JPS562776A JP7854479A JP7854479A JPS562776A JP S562776 A JPS562776 A JP S562776A JP 7854479 A JP7854479 A JP 7854479A JP 7854479 A JP7854479 A JP 7854479A JP S562776 A JPS562776 A JP S562776A
Authority
JP
Japan
Prior art keywords
visitor
circuit
call
speaker
contents
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
JP7854479A
Other languages
English (en)
Inventor
Koji Sakai
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to JP7854479A priority Critical patent/JPS562776A/ja
Publication of JPS562776A publication Critical patent/JPS562776A/ja
Pending 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)
JP7854479A 1979-06-21 1979-06-21 Door phone unit Pending JPS562776A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7854479A JPS562776A (en) 1979-06-21 1979-06-21 Door phone unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7854479A JPS562776A (en) 1979-06-21 1979-06-21 Door phone unit

Publications (1)

Publication Number Publication Date
JPS562776A true JPS562776A (en) 1981-01-13

Family

ID=13664850

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7854479A Pending JPS562776A (en) 1979-06-21 1979-06-21 Door phone unit

Country Status (1)

Country Link
JP (1) JPS562776A (ja)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4499335A (en) * 1983-01-14 1985-02-12 T.A.D. Avanti, Inc. Announcement recording and message playback system for a telephone answering machine
US4715060A (en) * 1985-07-15 1987-12-22 Lipscher Bernard N Door message apparatus with telephone answering device
US7150244B2 (en) 2004-06-10 2006-12-19 Dawes Charles J Window adaptable pet door

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4499335A (en) * 1983-01-14 1985-02-12 T.A.D. Avanti, Inc. Announcement recording and message playback system for a telephone answering machine
US4715060A (en) * 1985-07-15 1987-12-22 Lipscher Bernard N Door message apparatus with telephone answering device
US7150244B2 (en) 2004-06-10 2006-12-19 Dawes Charles J Window adaptable pet door

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