FR750184A - Improvements made and relating to photogelectric systems or devices - Google Patents

Improvements made and relating to photogelectric systems or devices

Info

Publication number
FR750184A
FR750184A FR750184DA FR750184A FR 750184 A FR750184 A FR 750184A FR 750184D A FR750184D A FR 750184DA FR 750184 A FR750184 A FR 750184A
Authority
FR
France
Prior art keywords
photogelectric
relating
systems
devices
improvements made
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
Alan Stewart Fitzgerald
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 filed Critical
Application granted granted Critical
Publication of FR750184A publication Critical patent/FR750184A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/18—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
FR750184D 1932-02-04 1933-02-04 Improvements made and relating to photogelectric systems or devices Expired FR750184A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US750184XA 1932-02-04 1932-02-04

Publications (1)

Publication Number Publication Date
FR750184A true FR750184A (en) 1933-08-05

Family

ID=22123028

Family Applications (1)

Application Number Title Priority Date Filing Date
FR750184D Expired FR750184A (en) 1932-02-04 1933-02-04 Improvements made and relating to photogelectric systems or devices

Country Status (1)

Country Link
FR (1) FR750184A (en)

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