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All Patents in class 175/420.1
Patents 1 - 3 of 3
Number	Title	Classification(s)
2,673,714	Rock or masonry drill	175/394, 175/397, 175/420.1
2,919,902	Masonry drill	175/394, 175/398, 175/403, 175/420.1, 175/421
4,595,322	Spade drill bit	175/394, 175/415, 175/420.1, 407/2, 408/223, 408/224, 408/230

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