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CONSTRUCTION SET FOR CONSTRUCTING OPTICAL PROJECTING APPARATUS
CONSTRUCTION SET FOR CONSTRUCTING OPTICAL PROJECTING APPARATUS
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机译:用于构造光学投影设备的构造套件
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摘要
A set of construction units or elements forming the subject of the invention permits the construction of various kinds or optical projection apparatus which are suitable for copying passages of literature and the like so as to produce in this way a collection of technical literature, for example in the form of a card index, for continuously supplementing the user's knowledge and for facilitating his scientific activities.
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