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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.
Spectroscope
BLEEKER
ca. 1960
Porro prism binocular 6×24
ca. 1950
Porro prism binocular 6×30
ca. 1953
Achromatic magnifier 10×
1950-1960