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Officegrinding Of Cement Mill

US2344504A US395591A US39559141A US2344504A US 2344504 A US2344504 A US 2344504A US 395591 A US395591 A US 395591A US 39559141 A US39559141 A US 39559141A US 2344504 A US2344504 A US 2344504A Authority US United States Prior art keywords stone grinding stones pressure ring Prior art date 1941-05-28 Legal status (The legal status is an assumption and is not a …