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In the 1920s,[citation needed] the RMA resistor color code was developed by the Radio Manufacturers Association (RMA) as a fixed resistor coloring code marking. In 1930, the first radios with RMA color-coded resistors were built.[1][2] Over many decades, as the organization name changed (RMA, RTMA, RETMA, EIA)[3] so was the name of the code. Though known most recently as EIA color code, the four name variations are found in books, magazines, catalogs, and other documents over more than 95 years.