ZA755927B - Improvements in telephone subsets - Google Patents
Improvements in telephone subsetsInfo
- Publication number
- ZA755927B ZA755927B ZA00755927A ZA755927A ZA755927B ZA 755927 B ZA755927 B ZA 755927B ZA 00755927 A ZA00755927 A ZA 00755927A ZA 755927 A ZA755927 A ZA 755927A ZA 755927 B ZA755927 B ZA 755927B
- Authority
- ZA
- South Africa
- Prior art keywords
- telephone subsets
- subsets
- telephone
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/26—Devices for calling a subscriber
- H04M1/30—Devices which can set up and transmit only one digit at a time
- H04M1/31—Devices which can set up and transmit only one digit at a time by interrupting current to generate trains of pulses; by periodically opening and closing contacts to generate trains of pulses
- H04M1/312—Devices which can set up and transmit only one digit at a time by interrupting current to generate trains of pulses; by periodically opening and closing contacts to generate trains of pulses pulses produced by electronic circuits
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Relay Circuits (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB53371/74A GB1480240A (en) | 1974-12-10 | 1974-12-10 | Telephone subsets |
Publications (1)
Publication Number | Publication Date |
---|---|
ZA755927B true ZA755927B (en) | 1976-08-25 |
Family
ID=10467565
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ZA00755927A ZA755927B (en) | 1974-12-10 | 1975-09-17 | Improvements in telephone subsets |
Country Status (3)
Country | Link |
---|---|
GB (1) | GB1480240A (en) |
HK (1) | HK13278A (en) |
ZA (1) | ZA755927B (en) |
-
1974
- 1974-12-10 GB GB53371/74A patent/GB1480240A/en not_active Expired
-
1975
- 1975-09-17 ZA ZA00755927A patent/ZA755927B/en unknown
-
1978
- 1978-03-09 HK HK132/78A patent/HK13278A/en unknown
Also Published As
Publication number | Publication date |
---|---|
GB1480240A (en) | 1977-07-20 |
HK13278A (en) | 1978-03-17 |
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