ECKHARDT, A. GEORGE |
Holland; England, fl.1770-99, MIM |
Dividers = Auction, 1799; Parallel Rules = Auction, 1799; Graphometer, mahogany = Auction, 1799. |
A. George Eckhardt, junr. invented a rolling parallel rule in 1770 which was made by Dollond; held fifteen patents; F.R.S. |
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Taylor 2(706); Mörzer Bruyns 2; Millburn 8. |
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