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Signature	Maker	Instruments	Comments	Location	References
ROWLAND, DAVID	England, fl.1814-33, MIM NIM		made sextants; patented improvements for sextant and quadrant circles; "an ingenious mechanic."	4 Cats Street, John Street, Edgeware Road; 68 Crawford Street (1833); both in London.	Taylor 2(1420).
ROWLAND, DAVID	England, fl.1814-33, MIM NIM		made sextants; patented improvements for sextant and quadrant circles; "an ingenious mechanic."	4 Cats Street, John Street, Edgeware Road; 68 Crawford Street (1833); both in London.	Taylor 2(1420).

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