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The bottom part used to shrink in shape because of the handles
were set on both sides only but now the handle has been added
to the rear portion to prevent from shrinkage of the cap.
Since the rear side handle is operating same as the side handle
while working for the seizure cap even without rear hook,
so it could have been able to solve the rear side puckering
completely.
An automatic operation by relay type from head i to head 5
can be achieved even without the operation hours and amount
and of steam can be adjustable freely.
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