Device for centering the light arc in spotlights

A device for centering the light arc in spotlights: No. 24989. Supponent.07/13/1911.Issue 09/28/1913 / "Shuckert and K".- [B.M .: B. and., 1913].-[1] p., 1 l.Il .. -Description of the device for centering the light arc in spotlights.To the privilege of the Russian Society of Shuckert and Co., in the city of St. Petersburg, stated on July 13, 1911 (okhr. St. No. 48836).Class 21f.No. 24989. The privilege issued on September 28, 1913..I. "Shuckert and Co.", Society (Petersburg) .1.People (collection).Electronic copy source: PBOriginal storage location: VPTB FIPS