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Signature	Maker	Instruments	Comments	Location	References
MUSSCHENBROEK, JOHAN JOOSTEN VAN	Holland, 1660-1707, OIM PHIM	Air Pumps = LEY (1698), UTR (1706), DEU; Microscope, aquatic = LEY; Microscopes = KEN, LEY.	succeeded his brother, Samuel van Musschenbroek; father of Jan van Musschenbroek; his master mark was a lamp with crossed keys; KEN and LEY microscopes are signed "Johann van Musschenbroek", but with proper master marks.	Leiden.	Crommelin 1; Rooseboom 1; Daumas 1; USNM; Clay and Court; A.J. Turner 10.
MUSSCHENBROEK, JOHAN JOOSTEN VAN	Holland, 1660-1707, OIM PHIM	Air Pumps = LEY (1698), UTR (1706), DEU; Microscope, aquatic = LEY; Microscopes = KEN, LEY.	succeeded his brother, Samuel van Musschenbroek; father of Jan van Musschenbroek; his master mark was a lamp with crossed keys; KEN and LEY microscopes are signed "Johann van Musschenbroek", but with proper master marks.	Leiden.	Crommelin 1; Rooseboom 1; Daumas 1; USNM; Clay and Court; A.J. Turner 10.

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