FR550349A - Bare-eared aircraft listening device - Google Patents

Bare-eared aircraft listening device

Info

Publication number
FR550349A
FR550349A FR550349DA FR550349A FR 550349 A FR550349 A FR 550349A FR 550349D A FR550349D A FR 550349DA FR 550349 A FR550349 A FR 550349A
Authority
FR
France
Prior art keywords
eared
bare
aircraft
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)
Inventor
Francois-Joseph Fulcrand
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 Barbier Benard and Turenne SA
Original Assignee
Anciens Etablissements Barbier Benard and Turenne SA
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 Barbier Benard and Turenne SA filed Critical Anciens Etablissements Barbier Benard and Turenne SA
Application granted granted Critical
Publication of FR550349A publication Critical patent/FR550349A/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)
FR550349D 1922-04-20 1922-04-20 Bare-eared aircraft listening device Expired FR550349A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR550349T 1922-04-20

Publications (1)

Publication Number Publication Date
FR550349A true FR550349A (en) 1923-03-03

Family

ID=8936128

Family Applications (1)

Application Number Title Priority Date Filing Date
FR550349D Expired FR550349A (en) 1922-04-20 1922-04-20 Bare-eared aircraft listening device

Country Status (1)

Country Link
FR (1) FR550349A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2807089A (en) * 1954-08-31 1957-09-24 Jr Donald A Lewis Sky lookout chair

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2807089A (en) * 1954-08-31 1957-09-24 Jr Donald A Lewis Sky lookout chair

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