FR574209A - Improvements to underwater sound signaling or indicating devices - Google Patents

Improvements to underwater sound signaling or indicating devices

Info

Publication number
FR574209A
FR574209A FR574209DA FR574209A FR 574209 A FR574209 A FR 574209A FR 574209D A FR574209D A FR 574209DA FR 574209 A FR574209 A FR 574209A
Authority
FR
France
Prior art keywords
underwater sound
indicating devices
sound signaling
signaling
indicating
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
Application number
Other languages
French (fr)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vickers Ltd
Original Assignee
Vickers Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Vickers Ltd filed Critical Vickers Ltd
Application granted granted Critical
Publication of FR574209A publication Critical patent/FR574209A/en
Expired legal-status Critical Current

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)
FR574209D 1923-12-03 1923-12-03 Improvements to underwater sound signaling or indicating devices Expired FR574209A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR574209T 1923-12-03

Publications (1)

Publication Number Publication Date
FR574209A true FR574209A (en) 1924-07-08

Family

ID=8952528

Family Applications (1)

Application Number Title Priority Date Filing Date
FR574209D Expired FR574209A (en) 1923-12-03 1923-12-03 Improvements to underwater sound signaling or indicating devices

Country Status (1)

Country Link
FR (1) FR574209A (en)

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