Original vintage mining magazine ad for AMERICAN RHEOLAVEUR CORPORATION of Wilkes-Barre, PA.  Amazed at How Easily the Operator Handled That Feed.  Hazleton Colliery Plant.  McCoy Washery, Great Valley Anthracite Corporation.  Cokedale Washery, American Smelting and Refining Company.  New Black Diamond Washery, Pacific Coast Coal Company.  Mr. Paul Sterling, Mechanical Engineer of the Lehigh Valley Coal Company gives a testimony.  Old two-page gatefold 1928 coal mining equipment industry advertisement.  Would display beautifully matted and framed!