 Two different 1953 patent applications use "Gray code" as an alternative name for the "reflected binary code"; one of those also lists "minimum error code" and "cyclic permutation code" among the names.A 1954 patent application refers to "the Bell Telephone Gray code".Other names include "cyclic binary code", "cyclic progression code", "cyclic permutating binary" or "cyclic permutated binary" (CPB).