| 摘要 |
In a preferred embodiment a microfilm jacket having plural parallel channels, each channel having at its insert opening a protruding upper-lip forming an insert opening formed by a slit extending rearwardly on both of opposite sides of the protruding lips and serving to guide microfilm fed beneath the protruding upper lip into the insert opening, with the rearwardly-extending slits extending different distances for different parallel channels relative to either one or both rearwardly extending sides of the slit.
|
