JPS5781753A - Improved double-telephone device - Google Patents

Improved double-telephone device

Info

Publication number
JPS5781753A
JPS5781753A JP55137439A JP13743980A JPS5781753A JP S5781753 A JPS5781753 A JP S5781753A JP 55137439 A JP55137439 A JP 55137439A JP 13743980 A JP13743980 A JP 13743980A JP S5781753 A JPS5781753 A JP S5781753A
Authority
JP
Japan
Prior art keywords
telephone
button
operated
call
additional device
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
JP55137439A
Other languages
Japanese (ja)
Other versions
JPH029742B2 (en
Inventor
Akinobu Sekiguchi
Tokuji Yamada
Minoru Sasai
Yoshio Nagasaki
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.)
KANDA TSUUSHIN KOGYO KK
Nippon Telegraph and Telephone Corp
Kanda Tsushin Kogyo Co Ltd
Original Assignee
KANDA TSUUSHIN KOGYO KK
Nippon Telegraph and Telephone Corp
Kanda Tsushin Kogyo 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 KANDA TSUUSHIN KOGYO KK, Nippon Telegraph and Telephone Corp, Kanda Tsushin Kogyo Co Ltd filed Critical KANDA TSUUSHIN KOGYO KK
Priority to JP55137439A priority Critical patent/JPS5781753A/en
Publication of JPS5781753A publication Critical patent/JPS5781753A/en
Publication of JPH029742B2 publication Critical patent/JPH029742B2/ja
Granted legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M1/00Substation equipment, e.g. for use by subscribers
    • H04M1/71Substation extension arrangements
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M1/00Substation equipment, e.g. for use by subscribers
    • H04M1/71Substation extension arrangements
    • H04M1/715Substation extension arrangements using two or more extensions per line

Abstract

PURPOSE:To add such functions as the privacy, holding, transfer, etc. to a conventional double-telephone set, by providing a button which is operated to catch a telephone circuit and an extension call button which is used to call out another telephone set, into an additional device of a telephone. CONSTITUTION:A relay H that switches the call line between the telephone circuit side and the extension side and another relay H that holds the telephone circuit are provided within a main device ME. At the same time, a button LK which is operated to catch the telephone circuit plus an extension call button RK which is operated to call out another telephone are installed within an additional device of a telephone. In such way, such functions as the privacy, holding, transfer, etc. are added to a conventional double-telephone set without even a minute modification. Accordingly the size of an additional device is extremely reduced.
JP55137439A 1980-10-01 1980-10-01 Improved double-telephone device Granted JPS5781753A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55137439A JPS5781753A (en) 1980-10-01 1980-10-01 Improved double-telephone device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55137439A JPS5781753A (en) 1980-10-01 1980-10-01 Improved double-telephone device

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP51037307A Division JPS597254B2 (en) 1976-04-05 1976-04-05 Improved parent-child telephone device

Publications (2)

Publication Number Publication Date
JPS5781753A true JPS5781753A (en) 1982-05-21
JPH029742B2 JPH029742B2 (en) 1990-03-05

Family

ID=15198644

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55137439A Granted JPS5781753A (en) 1980-10-01 1980-10-01 Improved double-telephone device

Country Status (1)

Country Link
JP (1) JPS5781753A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000059193A (en) * 1998-08-05 2000-02-25 Hakusan Mfg Co Ltd Composite type small current switch circuit

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03244950A (en) * 1990-02-20 1991-10-31 Mitsubishi Electric Corp Range hood
JPH04106444U (en) * 1991-02-28 1992-09-14 富士工業株式会社 Range food

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000059193A (en) * 1998-08-05 2000-02-25 Hakusan Mfg Co Ltd Composite type small current switch circuit

Also Published As

Publication number Publication date
JPH029742B2 (en) 1990-03-05

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