File:Heike Kamerlingh Onnes - 47 - Kamerlingh Onnes and chief of the cryogenic laboratory Gerrit Jan Flim (left) with the second helium liquefactor, 1919 Physics laboratory (Natuurkundig Laboratorium), Steenschuur, Leiden.png
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Heike_Kamerlingh_Onnes_-_47_-_Kamerlingh_Onnes_and_chief_of_the_cryogenic_laboratory_Gerrit_Jan_Flim_(left)_with_the_second_helium_liquefactor,_1919_Physics_laboratory_(Natuurkundig_Laboratorium),_Steenschuur,_Leiden.png (300 × 445 pixels, file size: 95 KB, MIME type: image/png)