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The Concept 50x is covered by one or more of the following Clifford Electronics U.S.A.
patents: 4,158,874; 4,233,642; 4,327,444; 4,383,242; 4,430,685; 4,845,464; 4,887,064; 4,890,108;
4,922,224; 4,997,053; 5,081,667; 5,146,215; 5,157,375; 5,467,070 and other patents pending.