Valve and wiping mechanism for asphalt dispensers

作者: William P Glade

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参考文章(7)
William F Middlestadt, Apparatus for dispensing fluent material ,(1945)
Cook Bernard, Gauge cock for steam boilers ,(1923)
James B Watts, Hot and cold water mixing valves ,(1951)
Blankner William, Pavement repairing and the like ,(1940)
Adam F Blumer, Eugene J Verret, Two-port valve for volatile liquid containers ,(1947)