FR697812A - Underwater signaling device - Google Patents

Underwater signaling device

Info

Publication number
FR697812A
FR697812A FR697812DA FR697812A FR 697812 A FR697812 A FR 697812A FR 697812D A FR697812D A FR 697812DA FR 697812 A FR697812 A FR 697812A
Authority
FR
France
Prior art keywords
signaling device
underwater signaling
underwater
signaling
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.)
Walker Signal & Equipment Corp
Original Assignee
Walker Signal & Equipment Corp
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 Walker Signal & Equipment Corp filed Critical Walker Signal & Equipment Corp
Application granted granted Critical
Publication of FR697812A publication Critical patent/FR697812A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/001—Two-way communication systems between a limited number of parties

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
FR697812D 1930-06-23 1930-06-23 Underwater signaling device Expired FR697812A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR697812T 1930-06-23

Publications (1)

Publication Number Publication Date
FR697812A true FR697812A (en) 1931-01-22

Family

ID=9047327

Family Applications (1)

Application Number Title Priority Date Filing Date
FR697812D Expired FR697812A (en) 1930-06-23 1930-06-23 Underwater signaling device

Country Status (1)

Country Link
FR (1) FR697812A (en)

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