Electricity Wiring Book Set 10 Volumes International Textbook 1939

Offering this very nice set of 10 different volumes on similar subject matter, electricity, wiring, meters, relays, motors etc.. All are in very good used condition, all have dark blue semi-hard covers with gold lettering on the spine, and raise lettering on the front cover, inside a fancy designed logo. All are published by International Textbook Company Scranton PA. U.S.A., and all are the same size and design 5" x 7.6". Copyright dates range from 1934 to 1939 on these 10 volumes, edition printing dates in this same year range. All have marbles inside cover pages, all have a red white and blue sticker on the inside blank page, small sticker with no writing on them. Here is a list of titles:
146E ELECTRICITY AND MAGNETISM,
147B D.C. MOTORS AND GENERATORS,
148B ALTERNATING CURRENTS,
150C RECTIFIERS-CONVERTERS-MOTOR APPLICATIONS,
155D SWITCHGEAR AND VOLTAGE REGULATION,
158 ELECTRONIC TUBES-CONTROL OR LIGHTING CIRCUITS,
549B PRACTICAL ELECTRICAL WIRING
562 RELAYS AND ELECTORMAGNETS
577B WATTHOUR METERS,
603 THEORY OF INDUSTIAL ELECTORNIC TUBES.
These numbers are volume numbers of a very large library of textbooks offered by this same company. The 10 numbered volumes listed are the select volumes offered in this sale, the same as in the pictures. Each book was written as a complete reference guide on the title subject. These are very well illustrated books, some have various types of diagrams, all designed for instruction on specifics about the title subject. Text is easy to understand. All these books have clean pages, with a few minor exceptions, some minor spotting on about 10 pages of the last two volumes mentioned, we couldn't find any with any damage to pages, or bindings, very clean overall. A few have very slight rubs on the spine or covers, but still rate in very good condition overall. A very nicely printed set of instruction books!