DescriptionMercury spectrum experiment.jpg 中文（中国大陆）：使用棱镜分光计观测的可见光波段汞原子光谱 English: Mercury spectrum observed through a dispersive prism. Date 10 November...
Multiple-Radio Mesh Modules, operating in the 802.11 wireless frequency spectrum. These modules are key building blocks of meshed networks that provide...
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extracted image: "The No. 1A Folding Pocket Kodak" in 1900 - from, The British journal of photography (IA britishjournalof47unse) (page 136 crop).jpg....
Heroes of the telegraph - Charles Wheatstone.jpg...
666 West Harvard Street Glendale California ad detail, from- American cinematographer. (Vol. 31, 1950) (IA americancinemato31unse) (page 13 crop).jpg....
