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Signature	Maker	Instruments	Comments	Location	References
KETTERER, ALOYSIUS	England; USA, fl.1789-90, PHIM		made barometers and thermometers; succeeded John Deregan; succeeded by Martin Fisher.	at the Sign of the Seven Stars, Race and Fourth Streets (1789); in house of Nicholas Hess on Race Street, opposite the German church (1790); both in Philadelphia, Pa.	Bedini 1 and 8; Gillingham 1.
KETTERER, ALOYSIUS	England; USA, fl.1789-90, PHIM		made barometers and thermometers; succeeded John Deregan; succeeded by Martin Fisher.	at the Sign of the Seven Stars, Race and Fourth Streets (1789); in house of Nicholas Hess on Race Street, opposite the German church (1790); both in Philadelphia, Pa.	Bedini 1 and 8; Gillingham 1.

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