FR737115A - Listening device - Google Patents

Listening device

Info

Publication number
FR737115A
FR737115A FR737115DA FR737115A FR 737115 A FR737115 A FR 737115A FR 737115D A FR737115D A FR 737115DA FR 737115 A FR737115 A FR 737115A
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
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.)
Anciens Etablissements Sautter Harle
Original Assignee
Anciens Etablissements Sautter Harle
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 Anciens Etablissements Sautter Harle filed Critical Anciens Etablissements Sautter Harle
Application granted granted Critical
Publication of FR737115A publication Critical patent/FR737115A/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)
FR737115D 1931-09-10 1931-09-10 Listening device Expired FR737115A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR737115T 1931-09-10

Publications (1)

Publication Number Publication Date
FR737115A true FR737115A (en) 1932-12-07

Family

ID=9131595

Family Applications (1)

Application Number Title Priority Date Filing Date
FR737115D Expired FR737115A (en) 1931-09-10 1931-09-10 Listening device

Country Status (1)

Country Link
FR (1) FR737115A (en)

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