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All Concept Series systems are covered by
one or more of the following Clifford Electronics USA 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