PB

Zelikov, E.How to build a wireless telegraph: a practical guide for electrical fans: from 50 Fig.- 2nd ed.-Petrograd;Moscow: Book of Military District M.P.Petrova, 1917. -32, [1] p.: il., Damn .. - (Library of electrical engineering).1. The people (collection).Electronic copy source: PBPlace of storage of the original: the Central Museum of Communications named after A.S.Popova