| 摘要 |
<p>1536946 Microfilm jacket P A KIEJZIK 31 Oct 1975 [8 Sept 1975] 11581/76 Heading B8K A microfilm jacket comprises upper and lower sheets welded together at their margins to define an elongate sheath, and an arcuate slot, e.g. 80, forming an insertion opening in the upper sheet, and which is convex towards the direction of insertion of microfilm and accessible by bending the part of the jacket on the convex side of the slot away from the slot. The jacket may comprise a plurality of parallel channels each having a plurality of insertion openings 80, 80<SP>1</SP>, 80<SP>11</SP>. One channel may be wider than the rest.</p> |
