| 摘要 |
<p>The sleeve consists of a pair of hinged flaps, each fitting one side of a record. One flap has a slot, extending from the central hole in the record to the outer flap side. The slot is of sufficient size, that the centre pin, on which the record rests, may move along it. A projection near the hinge eases handling of the sleeve. The flaps have a circumferential projection, to prevent its contact with the record surface, when the sleeve is closed.</p> |
