FR693696A - Improvements to research projectors - Google Patents

Improvements to research projectors

Info

Publication number
FR693696A
FR693696A FR693696DA FR693696A FR 693696 A FR693696 A FR 693696A FR 693696D A FR693696D A FR 693696DA FR 693696 A FR693696 A FR 693696A
Authority
FR
France
Prior art keywords
projectors
research
research projectors
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.)
Sperry Gyroscope Co Inc
Original Assignee
Sperry Gyroscope Co Inc
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 Sperry Gyroscope Co Inc filed Critical Sperry Gyroscope Co Inc
Application granted granted Critical
Publication of FR693696A publication Critical patent/FR693696A/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S8/00—Lighting devices intended for fixed installation
    • F21S8/003—Searchlights, i.e. outdoor lighting device producing powerful beam of parallel rays, e.g. for military or attraction purposes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
    • F21S45/40—Cooling of lighting devices
    • F21S45/42—Forced cooling
    • F21S45/43—Forced cooling using gas

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Discharge Lamp (AREA)
FR693696D 1930-04-11 1930-04-11 Improvements to research projectors Expired FR693696A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR693696T 1930-04-11
GB17170/30A GB355393A (en) 1930-04-11 1930-06-04 Improvements in or relating to searchlights

Publications (1)

Publication Number Publication Date
FR693696A true FR693696A (en) 1930-11-24

Family

ID=26215348

Family Applications (1)

Application Number Title Priority Date Filing Date
FR693696D Expired FR693696A (en) 1930-04-11 1930-04-11 Improvements to research projectors

Country Status (2)

Country Link
FR (1) FR693696A (en)
GB (1) GB355393A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007019074A1 (en) * 2007-04-23 2008-10-30 Zumtobel Lighting Gmbh Lamp with cooling
CN106050721A (en) * 2016-08-10 2016-10-26 钦州学院 Ceiling fan protection device

Also Published As

Publication number Publication date
GB355393A (en) 1931-08-27

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