This is a 1930s vintage Instruction Manual from "The Linde Air Products Company," titled "Principles and Operation of Prest-O-Weld Oxy-Acetylene Equipment," dated 1937, measures 6" x 9", illustrated, 44 pages, and is complete. Condition: This manual is offered as a reference or reading copy due to the following condition flaws: overall handling wear; several pages have damage on the right edge (no printing is affected); one page has foxing (light brown spotting); and the spine has notable wear. See my listings for other unusual, interesting and fun vintage items. Multiple purchases are combined with a single postage charge. All items are shipped sleeved in plastic, and packaged between sturdy cardboard.