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    • Type
    • Scientific Instruments6
    • Space Exploration2
    • Not Specified244
    • Sub-Type
    • Models7
    • Rulers1
    • Not Specified333
    • Period
    • 1951 to Present4
    • Not Specified332
    • Material
    • Brass5
    • Glass5
    • Not Specified318
    • Featured Refinements
    • Orrery10
    • Not Specified277