© Courtesy of the C. V. Starr East Asian Library, Columbia University.

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科學常識 袖珍留聲機, Common knowledge in science, a pocket gramophone

Keywords: invention, technology,

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(上圖) 開啓時之內容 (the picture above) the contents when one opens it

Keywords: electric equipment,

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(左圖) 關閉時之外觀 (the picture left) the appearance when one closes it

Keywords: electric equipment,