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file U (Stack)Voice, Eric H.
"The History of the Manufacture of Pencils"
offprint from Transactions of the Newcomen Society, vol. XXVII, 1949-50 and 1950-51, pp. 131-141 and plates. (Read at the Chartered Institute of Patent Agents, London, on 15 November, 1950).
[1959-27]
1949-1951