Scheme of the transmitter for unprofitable telegraphs and telephone

Scheme of the transmitter for unprofitable telegraphs and telephone: No. 28783. Supponent.12/11/1913.Issues on 09/30/1916 / "Marconi, a company of unprofitable telegraphs."- [B.M .: B. and., 1916].-[2] p., 1 l.Il .. -Description of the transmitter scheme for unprofitable telegraphs and telephone designed to reproduce continuous vibrations or groups of continuous vibrations.To the privilege of the British company of the unprofitable telegraph of Marconi, with limited liability (Marconi's Wireless Telegraph Company Limited), in London, declared on December 11, 1913 (og. St. No. 61039).Class 21a.No. 28783. The privilege issued on September 30, 1916..I. "Marconi", a company of unprofitable telegraph with limited liability (London) .1.People (collection).Electronic copy source: PBOriginal storage location: VPTB FIPS