Asymmetric double lens

Non -immemed double lens: No. 18421. Supponent.09.24.1907.Issues on 01/31/1911 / "Karl Zeiss".- [B.M .: B. and., 1911].-271-272 p., 1 l.Il.: table .. -Description of an asymmetric double lens.To the privilege of a foreign company "Carl Zeiss" (Carl Zeiss), in the city of Yen, in Germany, declared on September 24, 1907 (og. St. No. 33596).Group V. No. 18421. January 31, 1911.I. Zeiss Karl, company.Yena 1.People (collection).Electronic copy source: PBOriginal storage location: VPTB FIPS