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All Patents in class 414/790.6
Patents 1 - 2 of 2
Number	Date	Patentee	Title	Type
3,219,202	Nov. 23, 1965	H.W. Huffman	Screw pile and batch delivery
3,280,679	Oct. 25, 1966	H.W. Huffman	Screw pile and batch delivery

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