To obtain {HEAD ~ a tight seal} of the hood on the sabot by simple measures, particularly without a thread, {TAIL ~ the shell} of the hood is designed with a sealing rim applying against a smooth annular zone of the sabot 
To obtain { HEAD ~ a tight seal } of the hood on the sabot by simple measures , particularly without a thread , { TAIL ~ the shell } of the hood is designed with a sealing rim applying against a smooth annular zone of the sabot
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