Vintage IBM 1948 Manual Of Instruction Customer Engineering Codes Book RARE

Vintage 1949 IBM Customer Engineering Manual – Original Technical Service Book  Step back into the early days of computing with this authentic IBM Customer Engineering Manual from 1949. This manual was used by IBM field engineers to service and maintain punch card machines and related equipment—an important piece of computing and industrial history.  Details:  • Publisher: International Business Machines Corporation (IBM)  • Year: 1949  • Printed in U.S.A.  • Format: Post-bound manual (screw binding)  • Content includes:  • Alphabetical Interpreters (Type 552)  • Duplicating Punch Units  • Feed, stacker, and test sections  • Original vintage item (not a reprint)  Condition:  • Pre-owned with noticeable wear  • Spine is split/loose (see photos)  • Covers show scuffing and age wear  • Pages are intact with yellowing from age  • Binding screws present; pages still secure  • No major missing sections observed  Please review all photos carefully for condition details.