| 摘要 |
<P>PROBLEM TO BE SOLVED: To make it easy to open the cap without degradation of hermetic sealing. <P>SOLUTION: In the cap 1 provided with an inner ring 4 projecting from the internal face 3 of its top wall 2, the top wall 2 of the root of the inner ring 4 has thin wall portions 2a and 2b. <P>COPYRIGHT: (C)2003,JPO |
