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US62844870   [0001] 
US5915616A   [0034]  [0038] 
US6330965B   [0034]  [0038] 
US6241139B   [0034]  [0038] 
US5964394A   [0034] 
US7334717B   [0034] 
US7021086B   [0050] 
US6443964B   [0050] 
US63936717   [0059] 
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US9693772B   [0059]