FR516690A - Appareil électrique à signaux - Google Patents
Appareil électrique à signauxInfo
- Publication number
- FR516690A FR516690A FR516690A FR516690DA FR516690A FR 516690 A FR516690 A FR 516690A FR 516690 A FR516690 A FR 516690A FR 516690D A FR516690D A FR 516690DA FR 516690 A FR516690 A FR 516690A
- Authority
- FR
- France
- Prior art keywords
- electrical signal
- signal device
- electrical
- signal
- 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)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR516690T | 1920-06-08 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FR516690A true FR516690A (fr) | 1921-04-23 |
Family
ID=8915403
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR516690A Expired FR516690A (fr) | 1920-06-08 | 1920-06-08 | Appareil électrique à signaux |
Country Status (2)
| Country | Link |
|---|---|
| FR (1) | FR516690A (fr) |
| NL (1) | NL7999C (fr) |
-
0
- NL NL7999D patent/NL7999C/xx active
-
1920
- 1920-06-08 FR FR516690A patent/FR516690A/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| NL7999C (fr) |
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