a capsule of guarantee in synthetic resin for bottles, particularly suitable for bottles of mineral water, beer, soft drinks and the like

摘要

A bottle cap is provided with a circular inner peripheral relief member that is in opposition to a mating groove in the neck of the bottle. An annular collar is positioned beneath the relief member and is spaced from the neck of the bottle. A bottle opener is used to crack the annular collar to thereby indicate that the cap has been removed.