GB8417282D0 - Telephone installations - Google Patents
Telephone installationsInfo
- Publication number
- GB8417282D0 GB8417282D0 GB848417282A GB8417282A GB8417282D0 GB 8417282 D0 GB8417282 D0 GB 8417282D0 GB 848417282 A GB848417282 A GB 848417282A GB 8417282 A GB8417282 A GB 8417282A GB 8417282 D0 GB8417282 D0 GB 8417282D0
- Authority
- GB
- United Kingdom
- Prior art keywords
- telephone installations
- installations
- telephone
- 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.)
- Granted
Links
- 238000009434 installation Methods 0.000 title 1
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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/03—Constructional features of telephone transmitters or receivers, e.g. telephone hand-sets
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R17/00—Piezoelectric transducers; Electrostrictive transducers
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Telephone Set Structure (AREA)
- Piezo-Electric Transducers For Audible Bands (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19833341251 DE3341251A1 (en) | 1983-11-15 | 1983-11-15 | TELEPHONE SYSTEM |
Publications (3)
Publication Number | Publication Date |
---|---|
GB8417282D0 true GB8417282D0 (en) | 1984-08-08 |
GB2149998A GB2149998A (en) | 1985-06-19 |
GB2149998B GB2149998B (en) | 1987-03-18 |
Family
ID=6214353
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB08417282A Expired GB2149998B (en) | 1983-11-15 | 1984-07-06 | Improvements in telephone installations |
Country Status (3)
Country | Link |
---|---|
DE (1) | DE3341251A1 (en) |
GB (1) | GB2149998B (en) |
HK (1) | HK97387A (en) |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1406586A (en) * | 1964-06-09 | 1965-07-23 | Electronique & Automatisme Sa | Intrinsically safe telephone device |
DE2142858C3 (en) * | 1971-08-26 | 1974-01-10 | Siemens Ag, 1000 Berlin U. 8000 Muenchen | Circuit arrangement for generating an acoustic call signal for terminals in telecommunication systems, in particular telephone systems, by means of a piezo transducer |
-
1983
- 1983-11-15 DE DE19833341251 patent/DE3341251A1/en active Granted
-
1984
- 1984-07-06 GB GB08417282A patent/GB2149998B/en not_active Expired
-
1987
- 1987-12-24 HK HK97387A patent/HK97387A/en unknown
Also Published As
Publication number | Publication date |
---|---|
GB2149998A (en) | 1985-06-19 |
DE3341251A1 (en) | 1985-05-30 |
GB2149998B (en) | 1987-03-18 |
DE3341251C2 (en) | 1987-12-10 |
HK97387A (en) | 1987-12-31 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19920706 |