Putter to darken spotlights

Dutation device for spotlights: No. 25874. Supponent.10/23/1912.Issue 01/21/1914 / "Shuckert and K".- [B.M .: B. and., 1914].-[1] p., 1 l.Il .. -Description of the device for darkening spotlights.To the privilege of the Russian Society of Shuckert and Co., in the city of St. Petersburg, declared on October 23, 1912 (okhr. St. No. 54923).Class 21f.No. 25874. The privilege issued on January 21, 1914..I. "Shuckert and Co.", Society (Petersburg) .1.People (collection).Electronic copy source: PBOriginal storage location: VPTB FIPS