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Signature	Maker	Instruments	Comments	Location	References
ROELOFS, ARJEN	Holland, 1754-1828, MIM OIM PHIM		brother of Albert and Pieter Roelofs; worked with Syd Johannes Z. Rienks as Roelofs and Rienks, 1825; made microscopes and barometers, also made a cometarium and a jovilabium.	Hijum.	Rooseboom 1.
ROELOFS, ARJEN	Holland, 1754-1828, MIM OIM PHIM		brother of Albert and Pieter Roelofs; worked with Syd Johannes Z. Rienks as Roelofs and Rienks, 1825; made microscopes and barometers, also made a cometarium and a jovilabium.	Hijum.	Rooseboom 1.

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