FR520087A - Appareil sonore électromagnétique - Google Patents
Appareil sonore électromagnétiqueInfo
- Publication number
- FR520087A FR520087A FR520087A FR520087DA FR520087A FR 520087 A FR520087 A FR 520087A FR 520087 A FR520087 A FR 520087A FR 520087D A FR520087D A FR 520087DA FR 520087 A FR520087 A FR 520087A
- Authority
- FR
- France
- Prior art keywords
- sound device
- electromagnetic sound
- electromagnetic
- sound
- 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
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S1/00—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
- G01S1/72—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using ultrasonic, sonic or infrasonic waves
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE148978X | 1918-11-01 |
Publications (1)
Publication Number | Publication Date |
---|---|
FR520087A true FR520087A (fr) | 1921-06-20 |
Family
ID=5673089
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR520087A Expired FR520087A (fr) | 1918-11-01 | 1920-07-09 | Appareil sonore électromagnétique |
Country Status (2)
Country | Link |
---|---|
FR (1) | FR520087A (fr) |
GB (1) | GB148978A (fr) |
-
1920
- 1920-07-09 FR FR520087A patent/FR520087A/fr not_active Expired
- 1920-07-10 GB GB20838/20A patent/GB148978A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
GB148978A (en) | 1921-10-10 |
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