JPS5781753A - Improved double-telephone device - Google Patents
Improved double-telephone deviceInfo
- 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
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/71—Substation extension arrangements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/71—Substation extension arrangements
- H04M1/715—Substation 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.
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)
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)
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 |
-
1980
- 1980-10-01 JP JP55137439A patent/JPS5781753A/en active Granted
Cited By (1)
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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