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常压快开手孔
Quick open handholes for atmospheric use
参考页数：34P.;A4
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回转盖带颈对焊法兰手孔
Welding neck flange handholes with hinged cover
参考页数：36P.;A4
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带颈对焊法兰手孔
Welding neck flange handholes
参考页数：36P.;A4
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带颈平焊法兰手孔
Slip on flange handholes
参考页数：36P.;A4
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板式平焊法兰手孔
Plate flange handholes
参考页数：34P.;A4
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常压手孔
Handholes for atmospheric use
参考页数：34P.;A4
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回转拱盖快开人孔
Quick open manholes with hinged dome cover
参考页数：34P.;A4
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椭圆形回转盖快开人孔
Elliptical quick open manholes with hinged cover
参考页数：34P.;A4
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常压旋柄快开人孔
Quick open manholes for atmospheric use
参考页数：34P.;A4
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常压人孔
Manholes for atmospheric use
参考页数：34P.;A4
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