Patent Reviews: 5,473,470; 5,493,624; 5,532,818; 5,574,560;5,602,657; 5,606,414; 5,602,676; 5,642,210; 5,657,160; 5,719,676; 5,719,702;5,719,708; 5,737,127; 5,742,436; 5,757,532;5,757,535

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