BE773884A - Dispositif d'appel acoustique pour postes telephoniques - Google Patents
Dispositif d'appel acoustique pour postes telephoniquesInfo
- Publication number
- BE773884A BE773884A BE773884A BE773884A BE773884A BE 773884 A BE773884 A BE 773884A BE 773884 A BE773884 A BE 773884A BE 773884 A BE773884 A BE 773884A BE 773884 A BE773884 A BE 773884A
- Authority
- BE
- Belgium
- Prior art keywords
- call device
- telephone stations
- acoustic call
- acoustic
- stations
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
- G10K9/12—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated
- G10K9/13—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated using electromagnetic driving means
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
- G10K9/18—Details, e.g. bulbs, pumps, pistons, switches or casings
- G10K9/20—Sounding members
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Electromagnetism (AREA)
- Signal Processing (AREA)
- Telephone Set Structure (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19702062321 DE2062321C (de) | 1970-12-17 | Ruftongeber fur Fernsprechapparate |
Publications (1)
Publication Number | Publication Date |
---|---|
BE773884A true BE773884A (fr) | 1972-01-31 |
Family
ID=5791353
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
BE773884A BE773884A (fr) | 1970-12-17 | 1971-10-13 | Dispositif d'appel acoustique pour postes telephoniques |
Country Status (4)
Country | Link |
---|---|
AT (1) | AT322640B (xx) |
BE (1) | BE773884A (xx) |
CH (1) | CH536587A (xx) |
NL (1) | NL7114134A (xx) |
-
1971
- 1971-09-27 AT AT832671A patent/AT322640B/de not_active IP Right Cessation
- 1971-09-29 CH CH1416271A patent/CH536587A/de not_active IP Right Cessation
- 1971-10-13 BE BE773884A patent/BE773884A/xx unknown
- 1971-10-14 NL NL7114134A patent/NL7114134A/xx unknown
Also Published As
Publication number | Publication date |
---|---|
NL7114134A (xx) | 1972-06-20 |
AT322640B (de) | 1975-05-26 |
DE2062321A1 (de) | 1972-06-29 |
CH536587A (de) | 1973-04-30 |
DE2062321B2 (de) | 1972-11-02 |
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