Device in the spotlights to protect the negative electrode from the actions of the arc

Device in the spotlights to protect the negative electrode from the actions of the arc: No. 20577. Declared.03/10/1910.Issues on 02/28/1911 / "Shuckert and K".- [B.M .: B. and., 1911].-5773-5774 p., 1 liter.Il .. -Description of the device in the spotlights to protect the negative electrode from the action of the arc.The privilege declared on March 10, 1910 by the Joint-Stock Company of the Russian Electrotechnical Plants Siemens and Galsk and transferred, according to the petition of March 22, 1911, in the full property of the Russian Society of Shuckert and Co., in the city of St. Petersburg (okhr. Svid. No.42874).Group XI.No. 20577. December 28, 1911.I. "Shuckert and Co.", Society (Petersburg) .1.People (collection).Electronic copy source: PBOriginal storage location: VPTB FIPS