US War Dept. Technical Aircraft Manuals: TM 1-405, TM-411, & TM 1-413

This set of US War Department Technical Aircraft Manuals includes TM 1-405 Engines, TM 1-411 Airplane Hydraulic Systems, and TM 1-413 Aircraft Instruments. These manuals are original and were produced in the United States during World War II (1939-45). They are a valuable addition to any militaria collection and provide a glimpse into the technical specifications of American aircraft during this period. The manuals cover a range of topics including aircraft engines and instruments, and provide a fascinating insight into the development of American aviation technology.
Condition: both books have some writing on them by the original owner. The TM 1-405 Aircraft Engines has some mating on the front/back cover and some slight water damage, see photos. The water damage is not severe enough to damage the booklet or pages, it is more of a water staining. The TM 1-411 manual other than the slight marring on the front cover is in like new condition. * J2AA