Process of obtaining high-grade products from raw coal
United States Patent 1660009

Inventors:
Ludwig, Kuhlwein Fritz
Publication Date:
02/21/1928
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Assignee:
Firm, Chem Fab Billwarder IN. VO.
Primary Class:
209/5
Other Classes:
209/166
International Classes:
B03D1/02; B03D1/00