FR509946A - Phono-electric indicator - Google Patents

Phono-electric indicator

Info

Publication number
FR509946A
FR509946A FR509946A FR509946DA FR509946A FR 509946 A FR509946 A FR 509946A FR 509946 A FR509946 A FR 509946A FR 509946D A FR509946D A FR 509946DA FR 509946 A FR509946 A FR 509946A
Authority
FR
France
Prior art keywords
phono
electric indicator
indicator
electric
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
FR509946A
Other languages
French (fr)
Inventor
Luigi Podesta
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of FR509946A publication Critical patent/FR509946A/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)
FR509946A 1920-02-13 1920-02-13 Phono-electric indicator Expired FR509946A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR509946T 1920-02-13

Publications (1)

Publication Number Publication Date
FR509946A true FR509946A (en) 1920-11-23

Family

ID=8911397

Family Applications (1)

Application Number Title Priority Date Filing Date
FR509946A Expired FR509946A (en) 1920-02-13 1920-02-13 Phono-electric indicator

Country Status (1)

Country Link
FR (1) FR509946A (en)

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