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All Patents in class 172/491
Patents 1 - 2 of 2
Number	Title	Classification(s)
160,760	Steam Plow	172/111, 172/114, 172/297, 172/481, 172/483, 172/491, 180/36, 280/93.505
1,155,795	Scarifier	172/388, 172/491, 172/497

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