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Signature	Maker	Instruments	Comments	Location	References
GILKERSON AND MACALL	England, c.1770, MIM	Mathematical Instrument Set = X.		Tower Hill, London.	Taylor 2(716); Clay and Court; Dewhirst.
GILKERSON AND MACALL	England, c.1770, MIM	Mathematical Instrument Set = X.		Tower Hill, London.	Taylor 2(716); Clay and Court; Dewhirst.

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