FR421719A - Signal device - Google Patents

Signal device

Info

Publication number
FR421719A
FR421719A FR421719DA FR421719A FR 421719 A FR421719 A FR 421719A FR 421719D A FR421719D A FR 421719DA FR 421719 A FR421719 A FR 421719A
Authority
FR
France
Prior art keywords
signal device
signal
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)
Inventor
John Moyes
Charles Alexander Stevenson
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 FR421719A publication Critical patent/FR421719A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B7/00—Signalling systems according to more than one of groups G08B3/00 - G08B6/00; Personal calling systems according to more than one of groups G08B3/00 - G08B6/00
    • G08B7/06—Signalling systems according to more than one of groups G08B3/00 - G08B6/00; Personal calling systems according to more than one of groups G08B3/00 - G08B6/00 using electric transmission, e.g. involving audible and visible signalling through the use of sound and light sources

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
FR421719D 1910-03-07 1910-10-22 Signal device Expired FR421719A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB421719X 1910-03-07

Publications (1)

Publication Number Publication Date
FR421719A true FR421719A (en) 1911-03-03

Family

ID=1464742

Family Applications (1)

Application Number Title Priority Date Filing Date
FR421719D Expired FR421719A (en) 1910-03-07 1910-10-22 Signal device

Country Status (1)

Country Link
FR (1) FR421719A (en)

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