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[BREVET] DALOZ, Jules. Brevet d'invention pour une lampe électrique de sécurité pour mineurs. 

Paris, Direction de la propriété industrielle, 1925.

(320x235 mm), 6 pages and 1 folding plate.  binding : Folder printed on strong paper. Waterstains.

Patent filing dossier issued to Jules Daloz for an electric safety lamp intended for minors.
The purpose of this lamp was to avoid blows of gas by preventing the incandescent filament from coming into contact with the gas in the event of breakage.

Price : 30 €

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