| 摘要 |
An envelope-like packet defining a closed chamber for fluid to be dispensed and having side walls, at least one of which is flexible, and a rupturable end portion. An extensible envelope rupturing member is disposed in the chamber and includes an envelope rupturing point directed toward said rupturable portion. The rupturing member has spaced portions engaging the side walls, and is responsive to inward pressure imparted to said side walls against said spaced portions to extend the point into rupturing engagement with the rupturable portion of the envelope.
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