Inventor Duc, Henry A. jr.
Invention Attrition Mill
Residence Charleston
Dated 12/27/1881
Patent 251,535
Class 241/57
Assign *
US Patent Office Record http://patft1.uspto.gov/netacgi/nph-Parser?patentnumber=0251535
Local Copy of Patent Docs http://library.clemson.edu/scpatimages/index.php?pn=251535