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Maker
Country
Germany
Category
Various
Scientist with optical device DDR
N.V. Optische Industrie “de oude delft”, Delft, the Netherlands
1951
Instrumentenhandel Franken-Pohl, Amsterdam, the Hague, the Netherlands
1937
Luctor Baarn, the Netherlands
Instrumenten en Breukbanden, Amsterdam, the Netherlands
1909