442
442
Williams M.E.W. The Precision Makers. A History of the Instruments Industry in Britain and France, 1870–1939. London; N.Y., 1994. P. 45, 55.
442
Williams M.E.W. The Precision Makers. A History of the Instruments Industry in Britain and France, 1870–1939. London; N.Y., 1994. P. 45, 55.