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

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高維祥，林澤蒼最新發明 標準露光儀, Standard exposure meter, lately invented by Gao Weixiang, Lin Zecang

Keywords: photography, science,

(mentioned in advertisement), 中國攝影供應社 Zhongguo she ying Gongying she (mentioned in advertisement), 高維祥 Gao Weixiang (mentioned in advertisement),