Die drahtextension. Anleitung zum praktischen Gebrauch. By Prof. Dr. Rudolf Klapp and Dr. W. Rückert. 9⅝ × 6¼ in. Pp. 146 + viii, with 185 illustrations, some in two colours. 1937. Stuttgart : Ferdinand Enke. RM. 14; bound, RM. 15.80


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