FR544259A - Sound emitting device - Google Patents

Sound emitting device

Info

Publication number
FR544259A
FR544259A FR544259DA FR544259A FR 544259 A FR544259 A FR 544259A FR 544259D A FR544259D A FR 544259DA FR 544259 A FR544259 A FR 544259A
Authority
FR
France
Prior art keywords
emitting device
sound emitting
sound
emitting
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.)
Signal GmbH
Original Assignee
Signal GmbH
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 Signal GmbH filed Critical Signal GmbH
Application granted granted Critical
Publication of FR544259A publication Critical patent/FR544259A/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
FR544259D 1920-12-06 1921-12-06 Sound emitting device Expired FR544259A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE544259X 1920-12-06

Publications (1)

Publication Number Publication Date
FR544259A true FR544259A (en) 1922-09-19

Family

ID=6560356

Family Applications (1)

Application Number Title Priority Date Filing Date
FR544259D Expired FR544259A (en) 1920-12-06 1921-12-06 Sound emitting device

Country Status (1)

Country Link
FR (1) FR544259A (en)

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