VACUUM FLASK INCLUDING MEANS FOR SEALING THE MOUTH OF THE FLASK

摘要

We claim:- 1. In and for a vacuum flaak means for sealing th e geck of the flask within the tublular portion or neck of the shoulder characterised in that in the said neck of the shoulder is formed a recess in which is located a sealing ring said sealing ring projecting out of the aunular recess to hold against the neck of the flask