Nederlands: hoogleraarportret van professor L.H de Langen TU Delft, voorheen TH Delft afdeling Werktuigbouwkunde
English: portrait of professor L.H de Langen Technische Hogeschool Delft (currently known as Technical University Delft), faculty of Mechanical Engineering
Date
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TU Delft 3ME faculteit, vroeger TH Delft afdeling Werktuigbouwkunde
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TU Delft 3ME faculteit, vroeger TH Delft afdeling Werktuigbouwkunde
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