莫尔斯电码,"电气应用于商业 "研究,世界哥伦布博览会,芝加哥,伊利诺伊州(The Morse Code, Study for "Electricity as Applied to Commerce," Manufactures and Liberal Arts Building, World's Columbian Exposition, Chicago, IL)J·卡罗尔·贝克威斯,World's Columbian Exposition(For) |
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日期不详 · Black chalk and graphite on off-white paper
· 图片ID: 1292484
Smithsonian Institution, Gift of J.Carroll Beckwith |
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