FR664959A - Improvements to photoelectric cell protection devices - Google Patents

Improvements to photoelectric cell protection devices

Info

Publication number
FR664959A
FR664959A FR664959DA FR664959A FR 664959 A FR664959 A FR 664959A FR 664959D A FR664959D A FR 664959DA FR 664959 A FR664959 A FR 664959A
Authority
FR
France
Prior art keywords
protection devices
photoelectric cell
cell protection
photoelectric
devices
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.)
Societe des Etablissements Edouard Belin SA
Original Assignee
Societe des Etablissements Edouard Belin SA
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 Societe des Etablissements Edouard Belin SA filed Critical Societe des Etablissements Edouard Belin SA
Application granted granted Critical
Publication of FR664959A publication Critical patent/FR664959A/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
    • G08B13/181—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using active radiation detection systems
    • G08B13/183—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using active radiation detection systems by interruption of a radiation beam or barrier
    • G08B13/184—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using active radiation detection systems by interruption of a radiation beam or barrier using radiation reflectors
    • 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
    • G08B13/181—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using active radiation detection systems
    • G08B13/183—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using active radiation detection systems by interruption of a radiation beam or barrier

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
FR664959D 1928-03-10 1928-03-10 Improvements to photoelectric cell protection devices Expired FR664959A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR664959T 1928-03-10

Publications (1)

Publication Number Publication Date
FR664959A true FR664959A (en) 1929-09-12

Family

ID=9012996

Family Applications (1)

Application Number Title Priority Date Filing Date
FR664959D Expired FR664959A (en) 1928-03-10 1928-03-10 Improvements to photoelectric cell protection devices

Country Status (1)

Country Link
FR (1) FR664959A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE746365C (en) * 1936-09-18 1944-08-01 Siemens Ag Protection device for AC switchgear, especially busbars, against arcing

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE746365C (en) * 1936-09-18 1944-08-01 Siemens Ag Protection device for AC switchgear, especially busbars, against arcing

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