H.Dv.125/1 Fernmeldetechnik im Heere

H.Dv.125/1 Ferrnmeldetechnik im Heere. Heft 1 Allgemeine Elektrizitätslehre. Manual for army signals. General instructions about electricity. Proofed by Oberkommndo des Heeres. Published before WW2 (Reichswehr issue) by Verlag “Offene Worte”, Berlin. Many technical drawings. 116 pages. 20.5×14.5cm. Used condition, Complete.