materi impact hammer mill

y 1954 D. R. TULLIS 2,678,169 \ V IMPACT HAMMER MILL Filed April 17', 1951 Patented May 11, 1954 UNITED STATES TENT OFFICE This invention relates to impact hammer mills for grinding purposes of the type including a casing and mounted within the casing, a rotor to which are pivoted knife blades, the casing also containing a perforated or open-mesh, screen from which ground material is ...

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