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U.S. Patent 3,876,010
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U.S. Patent 3,876,011
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U.S. Patent 3,876,147
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U.S. Patent 3,876,571
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U.S. Patent 3,876,611
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U.S. Patent 3,876,612
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U.S. Patent 3,878,107
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U.S. Patent 3,883,319
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U.S. Patent 3,883,320
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U.S. Patent 3,883,463
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