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special test stands, in particular for environment simulation installations; gas testing instruments; the aforesaid apparatus for use in scientific research and laboratories; furnaces for laboratory use

ovens for heat treatment under inert gas; dry heat sterilizers; heat pumps; heat accumulators; heat exchangers, other than parts of machines; heating installations; heating apparatus for solid, liquid or gaseous fuels; water and air filtration installations for the extraction of pollutants; all of the aforesaid goods solely in the field of environmental, heating, indoor climate and pharmaceutical technology