FR2192421A1 - - Google Patents

Info

Publication number
FR2192421A1
FR2192421A1 FR7325040A FR7325040A FR2192421A1 FR 2192421 A1 FR2192421 A1 FR 2192421A1 FR 7325040 A FR7325040 A FR 7325040A FR 7325040 A FR7325040 A FR 7325040A FR 2192421 A1 FR2192421 A1 FR 2192421A1
Authority
FR
France
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.)
Granted
Application number
FR7325040A
Other languages
French (fr)
Other versions
FR2192421B3 (xx
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.)
Graseby Instruments Ltd
Original Assignee
Graseby Instruments Ltd
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 Graseby Instruments Ltd filed Critical Graseby Instruments Ltd
Publication of FR2192421A1 publication Critical patent/FR2192421A1/fr
Application granted granted Critical
Publication of FR2192421B3 publication Critical patent/FR2192421B3/fr
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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transmitters (AREA)
FR7325040A 1972-07-07 1973-07-09 Expired FR2192421B3 (xx)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3204472A GB1442595A (en) 1972-07-07 1972-07-07 Underwater telephone

Publications (2)

Publication Number Publication Date
FR2192421A1 true FR2192421A1 (xx) 1974-02-08
FR2192421B3 FR2192421B3 (xx) 1976-06-25

Family

ID=10332277

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7325040A Expired FR2192421B3 (xx) 1972-07-07 1973-07-09

Country Status (2)

Country Link
FR (1) FR2192421B3 (xx)
GB (1) GB1442595A (xx)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2119980B (en) * 1982-05-11 1985-10-16 Madelyn Carrol Freeman A device for use by a diver to give a signal
GB2414584A (en) * 2004-05-24 2005-11-30 Michael Anthony Wright Communication device for snorkellers

Also Published As

Publication number Publication date
FR2192421B3 (xx) 1976-06-25
GB1442595A (en) 1976-07-14

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Legal Events

Date Code Title Description
ST Notification of lapse