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Separation membrane filters for gas purification apparatus; Separation membrane filters being components of gas recovery apparatus, used to recover gases emitted during the extraction of oil; Ceramic membrane filters for recovering gas from associated gas generated during oil production, being parts of purification machines ; Ceramic membrane filters being parts of gas recovery apparatus, used to recover gas generated during oil production; Ceramic membrane filters for separating or removing gas during natural-gas processing, being parts of purification machines; Separation membrane filters of ceramics for industrial purposes, being parts of purification machines; Fittings, shaped for industrial furnaces, namely, column plates, shelf plates, floorboard, props and sagger of industrial furnaces; Parts and accessories for industrial furnaces, namely, kiln furniture; Industrial furnaces

Separation membrane filters of ceramics for chemical use, being parts of machines; Gas separation membrane filters being parts of gas separation machines; Gas separation membrane filters for chemical use, being parts of machines; Gas separation membrane filters for separating carbon dioxide from gas, being parts of machines; Gas separation membrane filters for separating nitrogen from gas, being parts of machines