| 摘要 |
In a microfilm retrieval device, the frame which is located at the position corresponding to the frame address is automatically retrieved to project the object frame on the screen of the reader. In such a retrieval device, it is necessary to be able to appropriately and precisely position the object frame regardless of the type and size of the frame pitch on the microfilm. Precise positioning of the object frame is accomplished by designating two arbitrary frames of different addresses and calculating the reference frame pitch between them.
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