FR537197A - Improvements to audio calls - Google Patents
Improvements to audio callsInfo
- Publication number
- FR537197A FR537197A FR537197DA FR537197A FR 537197 A FR537197 A FR 537197A FR 537197D A FR537197D A FR 537197DA FR 537197 A FR537197 A FR 537197A
- Authority
- FR
- France
- Prior art keywords
- audio calls
- calls
- audio
- 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
-
- 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
- G10K9/15—Self-interrupting arrangements
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB537197X | 1920-04-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
FR537197A true FR537197A (en) | 1922-05-17 |
Family
ID=10468761
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR537197D Expired FR537197A (en) | 1920-04-22 | 1921-04-19 | Improvements to audio calls |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR537197A (en) |
-
1921
- 1921-04-19 FR FR537197D patent/FR537197A/en not_active Expired
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