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FR802836A - Appareil d'écoute - Google Patents

Appareil d'écoute

Info

Publication number
FR802836A
FR802836A FR802836DA FR802836A FR 802836 A FR802836 A FR 802836A FR 802836D A FR802836D A FR 802836DA FR 802836 A FR802836 A FR 802836A
Authority
FR
France
Prior art keywords
listening device
listening
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
English (en)
Inventor
Maurice Claude
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 filed Critical
Application granted granted Critical
Publication of FR802836A publication Critical patent/FR802836A/fr
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)
FR802836D 1935-06-05 1935-06-05 Appareil d'écoute Expired FR802836A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR802836T 1935-06-05

Publications (1)

Publication Number Publication Date
FR802836A true FR802836A (fr) 1936-09-16

Family

ID=9249800

Family Applications (1)

Application Number Title Priority Date Filing Date
FR802836D Expired FR802836A (fr) 1935-06-05 1935-06-05 Appareil d'écoute

Country Status (1)

Country Link
FR (1) FR802836A (fr)

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