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All Patents in class 172/547
Patents 1 - 3 of 3
Number	Date	Patentee	Title	Type
9,602X	Apr. 21, 1836	J.C. Concklin	Harrow	harrows
79,540	Jul. 07, 1868	J. Armstrong	Rotary Harrow	harrows
500,253	Jun. 27, 1893	F. Syvrnd, A. Johnson	Revolving Harrow	harrows

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