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Signature	Maker	Instruments	Comments	Location	References
YSENBROEK, PIETER	Holland, 1701-76, MIM PHIM	Planetarium, 1738 = ADL-M392; Tellurian = UTP; Pyrometer = LEY; Barometer = X; Heliostat = X.	"textiel fabrikant"; author; itebtingf Ledenlijst Natuurkundig College, c.1737-76; the 1738 planetarium was improved in 1793 by Jan Peres in Haarlem.	Haarlem.	Zinner 1; Engelmann 1; Fox 1 & 2; Rooseboom 1; Daumas 1; USNM; Crommelin 1; Middleton 1; ADL; Teyler Museum Exhibition, 1988; RSW.
YSENBROEK, PIETER	Holland, 1701-76, MIM PHIM	Planetarium, 1738 = ADL-M392; Tellurian = UTP; Pyrometer = LEY; Barometer = X; Heliostat = X.	"textiel fabrikant"; author; itebtingf Ledenlijst Natuurkundig College, c.1737-76; the 1738 planetarium was improved in 1793 by Jan Peres in Haarlem.	Haarlem.	Zinner 1; Engelmann 1; Fox 1 & 2; Rooseboom 1; Daumas 1; USNM; Crommelin 1; Middleton 1; ADL; Teyler Museum Exhibition, 1988; RSW.

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