| 摘要 |
<p>The lock device (1) comprises a flask neck insertable piston (2) which is connected to an integral lock cap (3) that is reversible. The outer diameter of the piston fits into the inner diameter of the flask neck and has a length that corresponds to length that is a third to a half of the length of the flask. The piston may be telescopic or telescopic with graduations, whilst the lock cap may have a standard inner thread.</p> |
