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Abstrucz-This monograph reviews events, circa 1920-1960, leading to the development of spread-spectrum communication systems. The WHYN, Hush-Up, BLADES, F9C-A/Rake, CODORAC, and ARC-SO systems are featured, along with a description of the prior art in secure communications, and introductions to other early spreadspectrum communication efforts. References to the available literature from this period are included.doi:10.1109/tcom.1982.1095547 fatcat:dnq6cqgmvrf7baf2wtvmrevmn4