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U.S. Patent 3,814,610
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U.S. Patent 3,814,623
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U.S. Patent 3,814,624
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U.S. Patent 3,814,659
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U.S. Patent 3,814,661
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U.S. Patent 3,814,723
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U.S. Patent 3,817,701
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U.S. Patent 3,817,779
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U.S. Patent 3,817,851
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U.S. Patent 3,817,881
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