Very neat old manuals from the International Textbook Company of Scranton, PA, copyright 1934. Set of 4, includes #552, Storage Batteries, #555B, Alternators & AC Motors, #562N, Relays & Electromagnets and #549B, Practical Electrical Wiring. Very neat old manuals, in great, readable shape with minor signs of wear on covers. Hardback. I have a good number of these, please convo me if you are looking for a specific volume or subject. All manuals are $10 each with volume discounts.