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Signature	Maker	Instruments	Comments	Location	References
MATHIESEN AND RITTER	England, c.1840, NIM	Marine Compass in gimbals = DeLuca 8/1/87.	marked "By Royal Letters Patent."	17 Gracechurch Street, London.	RSW.
MATHIESEN AND RITTER	England, c.1840, NIM	Marine Compass in gimbals = DeLuca 8/1/87.	marked "By Royal Letters Patent."	17 Gracechurch Street, London.	RSW.

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