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Signature	Maker	Instruments	Comments	Location	References
HASSELSTROM, JOHAN GUSTAF	Sweden, 1747-1812, MIM OIM SIM	Instruments (9) = STT; Microscope = Physics Institute, Uppsala University; Universal Equatorial Sundial = SWE; Surveying Instrument = NOR; Transverse Scale = STM.	Johan Gustaf Hasselström, apprenticed to G.O. Duhre; in business alone in 1775; brief partnership with Johan Ihrmark; instrument maker to the Royal Swedish Academy of Science, 1777-1812; taught by J.P. Rosenberg; signed some instruments "I.G.H." (3), which see.	Stockholm.	Pipping 1; Fürst; Coffeen 9; ADL; RSW.
HASSELSTROM, JOHAN GUSTAF	Sweden, 1747-1812, MIM OIM SIM	Instruments (9) = STT; Microscope = Physics Institute, Uppsala University; Universal Equatorial Sundial = SWE; Surveying Instrument = NOR; Transverse Scale = STM.	Johan Gustaf Hasselström, apprenticed to G.O. Duhre; in business alone in 1775; brief partnership with Johan Ihrmark; instrument maker to the Royal Swedish Academy of Science, 1777-1812; taught by J.P. Rosenberg; signed some instruments "I.G.H." (3), which see.	Stockholm.	Pipping 1; Fürst; Coffeen 9; ADL; RSW.

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