FR679970A - - Google Patents
Info
- Publication number
- FR679970A FR679970A FR679970DA FR679970A FR 679970 A FR679970 A FR 679970A FR 679970D A FR679970D A FR 679970DA FR 679970 A FR679970 A FR 679970A
- Authority
- FR
- France
- 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)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE317089X | 1928-08-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FR679970A true FR679970A (en) | 1930-04-23 |
Family
ID=6150680
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR679970D Expired FR679970A (en) | 1928-08-10 |
Country Status (3)
| Country | Link |
|---|---|
| FR (1) | FR679970A (en) |
| GB (1) | GB317089A (en) |
| NL (1) | NL25808C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2083625B (en) * | 1980-09-10 | 1984-11-14 | Plessey Co Ltd | Improvements in or relating to sonar receivers |
| GB2083989A (en) * | 1980-09-10 | 1982-03-31 | Plessey Co Ltd | Ultrasonic reflectors |
-
0
- NL NL25808D patent/NL25808C/xx active
- FR FR679970D patent/FR679970A/fr not_active Expired
-
1929
- 1929-08-09 GB GB24426/29A patent/GB317089A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| NL25808C (en) | |
| GB317089A (en) | 1930-10-02 |