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Signature	Maker	Instruments	Comments	Location	References
CAMPBELL, JOHN 1	England, 1720-90,		improved Hadley' quadrant; devised a sextant; Vice-Admiral in the Royal Navy.		Taylor 2(335); Brewington 1.
CAMPBELL, JOHN 1	England, 1720-90,		improved Hadley' quadrant; devised a sextant; Vice-Admiral in the Royal Navy.		Taylor 2(335); Brewington 1.

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