To WILLIAM JOHN DOWDING ... for his invention of certain improvements in machinery for Rolling, or Rollering Wool from the Carding Engine. Enrolled January, 1828
Ib.
Journal of the Franklin Institute, of the State of Pennsylvania, for the Promotion of the Mechanic Arts; Devoted to Mechanical and Physical Science, Civil Engineering, the Arts and Manufactures, and the Recording of American and Other Patent Inventions (1828-1851); Philadelphia Vol. 4, Iss. 1, (Jul 1, 1829): 37.
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