Producer gas or water gas generators; acetylene gas generators and similar water process gas generators; distilling or rectifying plant; heat exchange units; machinery for liquefying air or gas

Gas generators; distilling plant; air-conditioning and refrigerating equipment; filtering machinery

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Producer gas or water gas generators; acetylene gas generators and the like; distilling or rectifying plant

Heat exchange units and machinery for liquefying air or other gases

Producer gas or water gas generators; acetylene gas generators and similar water process gas generators; distilling or rectifying plant; heat exchange units; machinery for liquefying air or gas

Distilling or rectifying plant; not used for domestic purposes

Heat exchange units; not used for domestic purposes

Machinery; for liquefying air or gas, not used for domestic purposes

Generators; producer gas, water gas, acetylene gas and similar water process gas generators, with or without their purifiers