GB374952A - Improvements in switching arrangements for telephone systems - Google Patents
Improvements in switching arrangements for telephone systemsInfo
- Publication number
- GB374952A GB374952A GB8514/31A GB851431A GB374952A GB 374952 A GB374952 A GB 374952A GB 8514/31 A GB8514/31 A GB 8514/31A GB 851431 A GB851431 A GB 851431A GB 374952 A GB374952 A GB 374952A
- Authority
- GB
- United Kingdom
- Prior art keywords
- relay
- energizes
- svr
- prepayment
- eor
- 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
- H04M17/00—Prepayment of wireline communication systems, wireless communication systems or telephone systems
- H04M17/02—Coin-freed or check-freed systems, e.g. mobile- or card-operated phones, public telephones or booths
- H04M17/023—Circuit arrangements
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Computer Security & Cryptography (AREA)
- Signal Processing (AREA)
- Interface Circuits In Exchanges (AREA)
- Prepayment Telephone Systems (AREA)
- Meter Arrangements (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE374952X | 1930-03-21 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB374952A true GB374952A (en) | 1932-06-20 |
Family
ID=20309104
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB8514/31A Expired GB374952A (en) | 1930-03-21 | 1931-03-19 | Improvements in switching arrangements for telephone systems |
Country Status (5)
Country | Link |
---|---|
US (1) | US1868378A (zh) |
BE (1) | BE378412A (zh) |
DE (1) | DE610040C (zh) |
FR (1) | FR713496A (zh) |
GB (1) | GB374952A (zh) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2707724A (en) * | 1952-10-07 | 1955-05-03 | Automatic Elect Lab | Coin control circuit for postpay telephone paystations |
-
0
- BE BE378412D patent/BE378412A/xx unknown
-
1931
- 1931-03-13 US US522462A patent/US1868378A/en not_active Expired - Lifetime
- 1931-03-18 FR FR713496D patent/FR713496A/fr not_active Expired
- 1931-03-19 GB GB8514/31A patent/GB374952A/en not_active Expired
- 1931-03-20 DE DET38570D patent/DE610040C/de not_active Expired
Also Published As
Publication number | Publication date |
---|---|
BE378412A (zh) | |
FR713496A (fr) | 1931-10-28 |
DE610040C (de) | 1935-03-05 |
US1868378A (en) | 1932-07-19 |
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