FR512842A - Improvements to projection devices - Google Patents

Improvements to projection devices

Info

Publication number
FR512842A
FR512842A FR512842DA FR512842A FR 512842 A FR512842 A FR 512842A FR 512842D A FR512842D A FR 512842DA FR 512842 A FR512842 A FR 512842A
Authority
FR
France
Prior art keywords
projection devices
projection
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.)
Compagnie Francaise Thomson Houston SA
Original Assignee
Compagnie Francaise Thomson Houston 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 Compagnie Francaise Thomson Houston SA filed Critical Compagnie Francaise Thomson Houston SA
Application granted granted Critical
Publication of FR512842A publication Critical patent/FR512842A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K1/00—Details
    • H01K1/18—Mountings or supports for the incandescent body
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K1/00—Details
    • H01K1/02—Incandescent bodies
    • H01K1/14—Incandescent bodies characterised by the shape
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K7/00—Lamps for purposes other than general lighting
    • H01K7/02—Lamps for purposes other than general lighting for producing a narrow beam of light; for approximating a point-like source of light, e.g. for searchlight, for cinematographic projector
FR512842D 1922-06-23 1920-03-31 Improvements to projection devices Expired FR512842A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1735822A GB198575A (en) 1922-06-23 1922-06-23 Improvements in and relating to filaments for electric incandescent lamps

Publications (1)

Publication Number Publication Date
FR512842A true FR512842A (en) 1921-02-01

Family

ID=10093776

Family Applications (2)

Application Number Title Priority Date Filing Date
FR512842D Expired FR512842A (en) 1922-06-23 1920-03-31 Improvements to projection devices
FR27536D Expired FR27536E (en) 1922-06-23 1923-03-10 Improvements to projection devices

Family Applications After (1)

Application Number Title Priority Date Filing Date
FR27536D Expired FR27536E (en) 1922-06-23 1923-03-10 Improvements to projection devices

Country Status (3)

Country Link
FR (2) FR512842A (en)
GB (1) GB198575A (en)
NL (2) NL7678C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5967655A (en) * 1996-04-22 1999-10-19 Hills; A. Wayne System for mixing cementing material and mineral aggregate

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5967655A (en) * 1996-04-22 1999-10-19 Hills; A. Wayne System for mixing cementing material and mineral aggregate

Also Published As

Publication number Publication date
NL12677C (en) 1924-03-15
GB198575A (en) 1923-06-07
FR27536E (en) 1924-07-28
NL7678C (en) 1922-03-15

Similar Documents

Publication Publication Date Title
FR532573A (en) Improvements to charging devices
FR512842A (en) Improvements to projection devices
FR534440A (en) Improvements to advertising devices
FR542135A (en) Improvements to cinematographic devices
FR537079A (en) Improvements to skating devices
FR529446A (en) Improvements to cinematographic projection devices
FR533931A (en) Improvements to refloating devices
FR544368A (en) Improvements to brushcutting devices
FR529092A (en) Improvements to cinematographic devices
FR523748A (en) Improvements to cinematographic devices
FR524491A (en) Improvements to cinematographic devices
FR527514A (en) Improvements to cinematographic devices
FR525197A (en) Improvements to grinding devices
FR542426A (en) Improvements to toy projection devices
FR541398A (en) Improvements to transport devices
FR547814A (en) Improvements to cinematographic projection devices
FR543691A (en) Improvements to cinematographic projection devices
FR571112A (en) Improvements to thermo-ionic devices
FR518529A (en) Improvements to light projector devices
FR517096A (en) Improvements to projection devices
FR520711A (en) Improvements to orthopedic devices
FR536536A (en) Improvements to cinematographic devices
FR533098A (en) Improvements to cinematographic devices
FR530967A (en) Improvements to cinematographic devices
FR548710A (en) Improvements to cinematographic devices