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

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無線電指導飛行, The Radio Wave Leading the Flight

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窗檻的防盜淚氣, Gas Device Set by the Windows to Prevent Thieves

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自蘸印墨的日戳, The Date Seal Which Refills the Seal Paste Automatically

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自蘸印墨的日戳 The Date Seal Which Refills the Seal Paste Automatically

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