JPH029743B2 - - Google Patents
Info
- Publication number
- JPH029743B2 JPH029743B2 JP55137440A JP13744080A JPH029743B2 JP H029743 B2 JPH029743 B2 JP H029743B2 JP 55137440 A JP55137440 A JP 55137440A JP 13744080 A JP13744080 A JP 13744080A JP H029743 B2 JPH029743 B2 JP H029743B2
- Authority
- JP
- Japan
- Prior art keywords
- telephone
- line
- switching element
- semiconductor switching
- telephone line
- 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
Links
- 239000004065 semiconductor Substances 0.000 claims description 17
- 239000003990 capacitor Substances 0.000 description 13
- 238000004804 winding Methods 0.000 description 10
- 238000012544 monitoring process Methods 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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
- H04M1/68—Circuit arrangements for preventing eavesdropping
- H04M1/70—Lock-out or secrecy arrangements in party-line systems
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Sub-Exchange Stations And Push- Button Telephones (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55137440A JPS5781754A (en) | 1980-10-01 | 1980-10-01 | Improved double-telephone set |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55137440A JPS5781754A (en) | 1980-10-01 | 1980-10-01 | Improved double-telephone set |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP51037307A Division JPS597254B2 (ja) | 1976-04-05 | 1976-04-05 | 改良形親子電話装置 |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5781754A JPS5781754A (en) | 1982-05-21 |
JPH029743B2 true JPH029743B2 (enrdf_load_html_response) | 1990-03-05 |
Family
ID=15198668
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP55137440A Granted JPS5781754A (en) | 1980-10-01 | 1980-10-01 | Improved double-telephone set |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5781754A (enrdf_load_html_response) |
-
1980
- 1980-10-01 JP JP55137440A patent/JPS5781754A/ja active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS5781754A (en) | 1982-05-21 |
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