Nomenclature
The term SCR was part of a nomenclature system developed for the U.S. Signal Corps, used at least as far back as World War I. Three-letter designators beginning with "SC" were used to denote complete systems, while one and two-letter designators (such as "BC", for basic component, "FT" for mounting, etc.) were used for components. Only a few system designators were used:
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- SCM Set, Complete, Meteorological
- SCR Set, Complete, Radio
- SCS Set, Complete, System
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Read more about this topic: Signal Corps Radio