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
1989ONORM 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