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Year/Period
1955-1965
Maker
Country
The Netherlands
Signature
Unsigned
Category
Other optical equipment
Subcategory
Thread counters
Donated by
P.P. de Bruijn, Zeist, the Netherlands
Inventory number
SM 146
See also SM 217.
Telescope
ONBEKEND/UNKNOWN
1900-1930
Butter refractometer after Wolney
ZEISS
ca. 1891
Universal refractometer after Abbe
BLEEKER
1950-1960
Folding magnifier
1920-1950