Vacuum sizing apparatus with controlled vacuum
作者： Ernest J. Preiato , Mark S. Hoopes , Marion M. Meetze , Robert H. Bessemer
DOI:
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摘要: A vacuum sizing apparatus with a controlled is provided. The precisely by the use of variable speed motor driven pump and step vent valve. An electrical circuit containing microprocessor coordinates position valve to give precise control within chambers apparatus. closed sump tank contains water for system maintained at same level as
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