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All Patents in class 81/449
Patents 1 - 2 of 2
Number	Date	Patentee	Title	Type
1,781,470	Nov. 11, 1930	E. Mueller	Screw holding screwdriver	screw starters
2,150,184	Mar. 14, 1939	G.F. Pearson	Screw holding screwdriver	screw starters

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