Ring frame advertised in 1882 Lowell Machine Shop trade catalog.
James Montgomery. A Practical Detail of the Cotton Manufacture of the United States of America…. Glasgow: J. Niven, 1840.
Manuscript credit ledger of R.G. Dun & Company, 1848. Includes entry for William Mason and Co., early manufacturers of ring frames.
Whitin Machine Works pictured in J. D. Van Slyck. Representatives of New England: Manufacturers. 2 vols. Boston: Van Slyck and Co., 1879.
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