CA989513A - Communication system - Google Patents

Communication system

Info

Publication number
CA989513A
CA989513A CA152,697A CA152697A CA989513A CA 989513 A CA989513 A CA 989513A CA 152697 A CA152697 A CA 152697A CA 989513 A CA989513 A CA 989513A
Authority
CA
Canada
Prior art keywords
communication system
communication
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
CA152,697A
Other versions
CA152697S (en
Inventor
John A.D. Weston
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
Priority to CA152,697A priority Critical patent/CA989513A/en
Application granted granted Critical
Publication of CA989513A publication Critical patent/CA989513A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B11/00—Transmission systems employing sonic, ultrasonic or infrasonic waves
    • 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
CA152,697A 1972-09-27 1972-09-27 Communication system Expired CA989513A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA152,697A CA989513A (en) 1972-09-27 1972-09-27 Communication system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA152,697A CA989513A (en) 1972-09-27 1972-09-27 Communication system

Publications (1)

Publication Number Publication Date
CA989513A true CA989513A (en) 1976-05-18

Family

ID=4094547

Family Applications (1)

Application Number Title Priority Date Filing Date
CA152,697A Expired CA989513A (en) 1972-09-27 1972-09-27 Communication system

Country Status (1)

Country Link
CA (1) CA989513A (en)

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