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U.S. Patent Sep. 1, 1998 Sheet 1 of 6 5,800,785

30 

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1:10170

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FIG. 2150/

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U S , Patent Sep. 1, 1998

2 3 0 

Sheet 2 of 6 5,800,785

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FIG. 5

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U.S. Patent Sep. 1, 1998 Sheet 4 of 6  5,800,785

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U.S. Patent Sep. 1, 1998 Sheet 5 of 6 5,800,785

640

660

FIG. 12

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U S . Patent Sep. 1, 1998 Sheet 6 of 6 5,800,785

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