Ordinary lens of three glasses

Ordinary lens of three glasses: No. 18420. Declared.09/24/1907.Issues on 01/31/1911 / "Karl Zeiss".- [B.M .: B. and., 1911].-[1] p., 1 l.Il.: table .. -Description of an ordinary lens of three glasses.To the privilege of a foreign company "Carl Zeiss" (Carl Zeiss), in the city of Jena, in Germany, declared on September 24, 1907 (okhr. Svid. No. 33587).Group V. No. 18420. January 31, 1911.I. Zeiss Karl, company.Yena 1.People (collection).Electronic copy source: PBOriginal storage location: VPTB FIPS