microfilm punched card aufnahmekamera and method to determine the optical density of the negative microfilm cards

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• 2. 一种用在缩微胶片阅读机中的精确定位装置 [P] . 中国专利： CN103543584A . 2014-01-29
• 3. microfilm punched card aufnahmekamera and method to determine the optical density of the negative microfilm cards [P] . AT368304B . 1982-10-11

  机译： 缩微胶片冲孔卡的制作方法和确定负缩微胶片卡的光密度的方法

• 4. Microfilm - reading device for microfilm - punched cards or microfiches [P] . 德国专利： DE1810959B1 . 1970-08-27

  机译： 缩微胶片-缩微胶片读取装置-穿孔卡或缩微胶片

• 5. Microfilm - reading device for microfilm - punched cards or microfiches [P] . 法国专利： FR2024254A1 . 1970-08-28

  机译： 缩微胶片-缩微胶片读取装置-穿孔卡或缩微胶片

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