GB1043710A - Improvements relating to manually controlled electrical systems with visual indication - Google Patents
Improvements relating to manually controlled electrical systems with visual indicationInfo
- Publication number
- GB1043710A GB1043710A GB4452862A GB4452862A GB1043710A GB 1043710 A GB1043710 A GB 1043710A GB 4452862 A GB4452862 A GB 4452862A GB 4452862 A GB4452862 A GB 4452862A GB 1043710 A GB1043710 A GB 1043710A
- Authority
- GB
- United Kingdom
- Prior art keywords
- master
- slave
- visual indication
- manually controlled
- electrical systems
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M9/00—Arrangements for interconnection not involving centralised switching
- H04M9/001—Two-way communication systems between a limited number of parties
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Telephone Set Structure (AREA)
Abstract
1,043,710. Telephone intercommunication systems. HADLEY TELEPHONE & SOUND SYSTEMS Ltd. Nov. 25, 1963 [Nov. 24, 1962], No. 44528/62. Heading H4K. A master-slave intercommunication system includes a separate cold cathode trigger tube or thyratron V and a pair of contacts E1, E2 for each slave circuit. The tubes V are mounted in the housing of the master unit so as to be visible, their luminosity then indicating when they are conductive. A circuit to a slave unit is completed by the operator bridging the corresponding contacts E1, E2 with his finger, and is subsequently broken by opening switch S2. The master unit can be called from a slave unit by opening switch S1 momentarily, amplifier A being reversible so that the master loud-speaker can act either as an audio-to-electrical or an electrical-to-audio transducer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4452862A GB1043710A (en) | 1962-11-24 | 1962-11-24 | Improvements relating to manually controlled electrical systems with visual indication |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4452862A GB1043710A (en) | 1962-11-24 | 1962-11-24 | Improvements relating to manually controlled electrical systems with visual indication |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1043710A true GB1043710A (en) | 1966-09-21 |
Family
ID=10433722
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4452862A Expired GB1043710A (en) | 1962-11-24 | 1962-11-24 | Improvements relating to manually controlled electrical systems with visual indication |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1043710A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3805086A (en) * | 1971-11-16 | 1974-04-16 | Magic Dot Inc | Touch sensitive electronic switch |
| US3944843A (en) * | 1973-03-09 | 1976-03-16 | Filinto Vaz Martins | Impedance responsive touch actuated circuit |
-
1962
- 1962-11-24 GB GB4452862A patent/GB1043710A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3805086A (en) * | 1971-11-16 | 1974-04-16 | Magic Dot Inc | Touch sensitive electronic switch |
| US3944843A (en) * | 1973-03-09 | 1976-03-16 | Filinto Vaz Martins | Impedance responsive touch actuated circuit |
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