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Signature	Maker	Instruments	Comments	Location	References
SCHMITZ, P.	Holland, c.1837, PHIM	Hygrometer = UTR.	sensitive material is wood; Schmitz was assistant to Prof. J.G. Crahay, Athenaeum at Massricht; later an engineer at Delft; made barometers and thermometers.	Maasricht; Delft.	Crommelin; Rooseboom 1.
SCHMITZ, P.	Holland, c.1837, PHIM	Hygrometer = UTR.	sensitive material is wood; Schmitz was assistant to Prof. J.G. Crahay, Athenaeum at Massricht; later an engineer at Delft; made barometers and thermometers.	Maasricht; Delft.	Crommelin; Rooseboom 1.

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