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U.S. Patent 3,779,956
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U.S. Patent 3,779,983
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U.S. Patent 3,779,984
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U.S. Patent 3,779,987
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U.S. Patent 3,780,112
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U.S. Patent 3,780,142
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U.S. Patent 3,781,388
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U.S. Patent 3,783,133
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