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Signature	Maker	Instruments	Comments	Location	References
JOHNSON AND BLACKBURN	England, fl.1847-48, PHIM		William Johnson 3 and Cuthbert Blackburn; barometer and thermometer makers.	34 Hatton Garden, London.	Goodison 1; Bell 2.
JOHNSON AND BLACKBURN	England, fl.1847-48, PHIM		William Johnson 3 and Cuthbert Blackburn; barometer and thermometer makers.	34 Hatton Garden, London.	Goodison 1; Bell 2.

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