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Signature	Maker	Instruments	Comments	Location	References
EWING, JOHN	USA, 1732-1802, NIM		described and illustrated an improvement of Godfrey's quadrant; provost of the College of Philadelphia.	Philadelphia, Pa.	Cajori; USNM; D.J. Warner 10.
EWING, JOHN	USA, 1732-1802, NIM		described and illustrated an improvement of Godfrey's quadrant; provost of the College of Philadelphia.	Philadelphia, Pa.	Cajori; USNM; D.J. Warner 10.

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