| 摘要 |
1,027,844. Container closures. BUHLER GEB. Feb. 14, 1963 [Feb. 15, 1962], No. 6121/63. Heading B8T. A screw-cap 3 with a central depression 6 of a frusto-conical shape, has one or more annular sealing projections 7 adapted to sealingly engage a container with a complementary frusto-conical neck 5. The projections may be step-like with their outer walls either parallel to or at a slight angle to the vertical. |
