ONORM M 7435 Teil 6-1989 Gasketsfor gas supplies gaskets made ofgasket materials based on synthetic fibres or graphitefor gas valves gas appliances and gas pipelines《天然气供应密合 基于气体阀门 燃气用具和天然气管道用合成.pdf

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ONORM M 7435 Teil 6-1989 Gasketsfor gas supplies gaskets made ofgasket materials based on synthetic fibres or graphitefor gas valves gas appliances and gas pipelines《天然气供应密合 基于气体阀门 燃气用具和天然气管道用合成.pdf_第1页
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