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All Patents in class 56/DIG.006
Patents 1 - 2 of 2
Number	Date	Patentee	Title	Type
254,283	Feb. 28, 1882	L.D. Dana	Friction-clutch	industrial machine clutches
431,446	Jul. 01, 1890	L.D. Dana	Friction-clutch	industrial machine clutches

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