ZA73305B - Improvements in or relating to electric circuits for telephone instruments - Google Patents
Improvements in or relating to electric circuits for telephone instrumentsInfo
- Publication number
- ZA73305B ZA73305B ZA730305A ZA73305A ZA73305B ZA 73305 B ZA73305 B ZA 73305B ZA 730305 A ZA730305 A ZA 730305A ZA 73305 A ZA73305 A ZA 73305A ZA 73305 B ZA73305 B ZA 73305B
- Authority
- ZA
- South Africa
- Prior art keywords
- relating
- electric circuits
- telephone instruments
- instruments
- telephone
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M19/00—Current supply arrangements for telephone systems
- H04M19/08—Current supply arrangements for telephone systems with current supply sources at the substations
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Devices For Supply Of Signal Current (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB585172A GB1370956A (en) | 1972-02-08 | 1972-02-08 | Electric circuits for telephone instruments |
Publications (1)
Publication Number | Publication Date |
---|---|
ZA73305B true ZA73305B (en) | 1973-10-31 |
Family
ID=9803826
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ZA730305A ZA73305B (en) | 1972-02-08 | 1973-01-16 | Improvements in or relating to electric circuits for telephone instruments |
Country Status (4)
Country | Link |
---|---|
AU (1) | AU473616B2 (en) |
GB (1) | GB1370956A (en) |
IT (1) | IT977696B (en) |
ZA (1) | ZA73305B (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4064366A (en) * | 1976-01-15 | 1977-12-20 | Winster Engineering Group Limited | Intrinsically safe telephone systems |
US4691344A (en) * | 1986-01-21 | 1987-09-01 | Aquatrol Corporation | Low-powered remote sensor and telephone line transmitter |
US4893332A (en) * | 1986-05-12 | 1990-01-09 | Aquatrol Corporation | Low-powered remote sensor |
DE19619610A1 (en) * | 1996-05-15 | 1997-11-20 | Bosch Gmbh Robert | Telephone device |
-
1972
- 1972-02-08 GB GB585172A patent/GB1370956A/en not_active Expired
-
1973
- 1973-01-16 AU AU51136/73A patent/AU473616B2/en not_active Expired
- 1973-01-16 ZA ZA730305A patent/ZA73305B/en unknown
- 1973-01-29 IT IT7367173A patent/IT977696B/en active
Also Published As
Publication number | Publication date |
---|---|
GB1370956A (en) | 1974-10-16 |
IT977696B (en) | 1974-09-20 |
AU473616B2 (en) | 1976-06-24 |
AU5113673A (en) | 1974-07-18 |
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