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Signature	Maker	Instruments	Comments	Location	References
GREENWOOD, ISAAC 3	USA, 1758-1829, MIM NIM OIM SIM	Hadley's Quadrants = MYS (1793), X; Gauging Rod, wood, 1819 = D.(1982); Gunner's Quadrant = Winterthur Museum, Wilmington, Del; Surveyor's Compasses = D.(1985), P.C.; Octants = MYS (1793), P.C.	son of Isaac Greenwood 2; took over his brother Clarke's business at his death in 1810; see Isaac Greenwood 2 for other possible instruments; T.C., akes and imports all kinds of Mathematical Instruments"; dentist.	Boston, Mass. (1781-83); New York, N.Y. (1783); Charleston, S. Carolina; Boston, Mass.; Providence, R.I. (1787-90); Newport, R.I.; Providence, R.I.; Norfolk. Conn.; Providence, R.I.; 126 Front Street (1810-1819); 130 Front Street (1819-29); last two in New York, N.Y.	Smart 1; Coffeen 27; Bedini 8, 14; D.J Warner 8 and 10; RSW.
GREENWOOD, ISAAC 3	USA, 1758-1829, MIM NIM OIM SIM	Hadley's Quadrants = MYS (1793), X; Gauging Rod, wood, 1819 = D.(1982); Gunner's Quadrant = Winterthur Museum, Wilmington, Del; Surveyor's Compasses = D.(1985), P.C.; Octants = MYS (1793), P.C.	son of Isaac Greenwood 2; took over his brother Clarke's business at his death in 1810; see Isaac Greenwood 2 for other possible instruments; T.C., akes and imports all kinds of Mathematical Instruments"; dentist.	Boston, Mass. (1781-83); New York, N.Y. (1783); Charleston, S. Carolina; Boston, Mass.; Providence, R.I. (1787-90); Newport, R.I.; Providence, R.I.; Norfolk. Conn.; Providence, R.I.; 126 Front Street (1810-1819); 130 Front Street (1819-29); last two in New York, N.Y.	Smart 1; Coffeen 27; Bedini 8, 14; D.J Warner 8 and 10; RSW.

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