| 摘要 |
FIELD: process engineering. ^ SUBSTANCE: proposed cover comprises clamping element that stays as-folded when it does hinder stacking the covers, and in clamping position when its clamping surface may be accessed. The cover incorporates a flexible element that moves aforesaid clamping element from as-folded position into clamping position. ^ EFFECT: ease of use. ^ 10 cl, 5 dwg |
