Steam boiler
申请公布号:US2067669(A)
申请号:US19290362516
申请日期:1929.05.13
申请公布日期:1937.01.12
发明人:KERR HOWARD J.;LANGVAND IVAR L.
分类号:F22G7/14
主分类号:F22G7/14
CROSSLINKED VINYLPYRROLIDONE POLYMERS
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