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I Fig. 1 is a partial, vertical crosssectional View of so much of a hammer mill as is needed to illustrate my improvements. r Fig. 2 is a fragmentary end view of my improved hammer together with some''of the associated parts. 7 f . F ig. 3 is''a reduced scale partial crosssectional View of a typical hammer mill. Referring to the drawings, in Fig. 3 there is shown a mill in which my improved