27 216 Bezplatné obrázky pro Led

Micro-combustion apparatus, E. H. Sargent & Co., Chicago, c. 1940, used by Dr. Karl Paul Link to isolate dicoumarol, which led to Warfarin - Wisconsin Historical Museum - DSC03376
Light-Emitting Diode (LED), on loan from Professor Nick Holonyak, United States, c. 1950 - Spurlock Museum, UIUC - DSC05949
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