Cross Index of Electron Tube Type Forth Edition April 1946 War Department

This is a rare and highly sought-after book titled "Cross Index of Electron Tube Type Fourth Edition April 1946 War Department." It contains information about electron tubes used during World War II (1939-45) and is an original piece of militaria from the United States. The book is in excellent condition and is a valuable addition to any militaria or collector's collection. One-of-a-kind, very rare Please see all pictures