ZA71885B - Improvements in or relating to telephone instruments - Google Patents
Improvements in or relating to telephone instrumentsInfo
- Publication number
- ZA71885B ZA71885B ZA710885A ZA71885A ZA71885B ZA 71885 B ZA71885 B ZA 71885B ZA 710885 A ZA710885 A ZA 710885A ZA 71885 A ZA71885 A ZA 71885A ZA 71885 B ZA71885 B ZA 71885B
- Authority
- ZA
- South Africa
- Prior art keywords
- relating
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB6919/70A GB1298449A (en) | 1970-02-12 | 1970-02-12 | Improvements in or relating to telephone instruments |
Publications (1)
Publication Number | Publication Date |
---|---|
ZA71885B true ZA71885B (en) | 1972-02-23 |
Family
ID=9823253
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ZA710885A ZA71885B (en) | 1970-02-12 | 1971-02-12 | Improvements in or relating to telephone instruments |
Country Status (3)
Country | Link |
---|---|
AU (1) | AU2539671A (en) |
GB (1) | GB1298449A (en) |
ZA (1) | ZA71885B (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2282198A1 (en) * | 1974-08-12 | 1976-03-12 | Trt Telecom Radio Electr | Keyboard telephone for long lines - uses speech loop current to power MOS circuit |
GB2242793B (en) * | 1990-04-05 | 1994-08-10 | Technophone Ltd | Battery charging apparatus |
-
1970
- 1970-02-12 GB GB6919/70A patent/GB1298449A/en not_active Expired
-
1971
- 1971-02-12 AU AU25396/71A patent/AU2539671A/en not_active Expired
- 1971-02-12 ZA ZA710885A patent/ZA71885B/en unknown
Also Published As
Publication number | Publication date |
---|---|
GB1298449A (en) | 1972-12-06 |
AU2539671A (en) | 1972-08-17 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
HK42376A (en) | Improvements in or relating to display devices | |
HK42277A (en) | Improvements in or relating to semiconductors | |
HK47276A (en) | Improvements in or relating to aerators | |
MY7500223A (en) | Improvement in or relating to keyboards | |
ZA716948B (en) | Improvements in or relating to mechanisms | |
IL36491A0 (en) | Improvements in or relating to electrodes | |
ZA714242B (en) | Improvements in or relating to display devices | |
ZA727425B (en) | Improvements in or relating to loud-speaking telephone instruments | |
ZA716467B (en) | An improvement in or relating to enclosed switchgear | |
ZA718228B (en) | Improvements in or relating to telephone handsets | |
ZA71885B (en) | Improvements in or relating to telephone instruments | |
AU3535771A (en) | Improvements in or relating to wig-making | |
MY7300498A (en) | Improvements in or relating to telecommunication cables | |
ZA712296B (en) | Improvements in or relating to insulators | |
AU2990671A (en) | Improvements in or relating to sulphonylsemicarbazides | |
ZA724726B (en) | Improvements in or relating to telephone circuits | |
ZA701099B (en) | Improvements in or relating to drawing instruments | |
ZA71202B (en) | Improvements in or relating to screw-pumps | |
AU462402B2 (en) | Improvements in or relating to tool-retaining means | |
ZA737963B (en) | Improvements in or relating to telephone sets | |
AU439233B2 (en) | Improvements in or relating to telephones | |
ZA714284B (en) | Improvements in or relating to fuse-holders | |
ZA705172B (en) | Improvements in or relating to braais | |
ZA704658B (en) | Improvements in or relating to sun-visors | |
ZA713685B (en) | Improvements in or relating to sulphonylsemicarbazides |