Cathode-ray tube device to measure density differences of photographic transparencies

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• 2. 用于135、120胶片照相机的数码照相装置 [P] . 中国专利： CN2718621Y . 2005.08.17
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  机译： 用于测量照相透明度的装置

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  机译： 测量照相透明度的装置和方法

• 5. A DEVICE AND METHOD FOR MEASURING PHOTOGRAPHIC TRANSPARENCY DENSITY [P] . 英国专利： GB2108353A . 1983-05-11

  机译： 测量照相透明度的装置和方法

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