FR666475A - Improvements to incandescent electric lamps - Google Patents

Improvements to incandescent electric lamps

Info

Publication number
FR666475A
FR666475A FR666475DA FR666475A FR 666475 A FR666475 A FR 666475A FR 666475D A FR666475D A FR 666475DA FR 666475 A FR666475 A FR 666475A
Authority
FR
France
Prior art keywords
electric lamps
incandescent electric
incandescent
lamps
electric
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
Ringhald Andersson
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 FR666475A publication Critical patent/FR666475A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01KELECTRIC INCANDESCENT LAMPS
    • H01K9/00Lamps having two or more incandescent bodies separately heated
    • H01K9/02Lamps having two or more incandescent bodies separately heated to provide substitution in the event of failure of one of the bodies
    • H01K9/04Lamps having two or more incandescent bodies separately heated to provide substitution in the event of failure of one of the bodies with built-in manually operated switch
FR666475D 1928-10-16 1928-12-28 Improvements to incandescent electric lamps Expired FR666475A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB666475X 1928-10-16

Publications (1)

Publication Number Publication Date
FR666475A true FR666475A (en) 1929-10-02

Family

ID=40560265

Family Applications (1)

Application Number Title Priority Date Filing Date
FR666475D Expired FR666475A (en) 1928-10-16 1928-12-28 Improvements to incandescent electric lamps

Country Status (1)

Country Link
FR (1) FR666475A (en)

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