Industrial heat exchangers and parts thereof; industrial apparatus for processing materials in gaseous form, being engineering contrivances, namely, scrubber, absorption, fractionating and stripper towers and columns and parts thereof,

Centrifugal pumps and parts thereof; bushing and bearings for machinery; valves, being parts of machinery,

Resin-impregnated impervious carbon and graphite for industrial purposes, being in the nature of partly prepared mineral substances used in manufactures,

Carbon and graphite construction materials and structural elements, being manufactures from mineral substances for building, namely, bricks, beams, blocks, plates, slabs, tiles, rods, pipes and tubes for use in the construction of buildings, tanks, industrial apparatus, and structures in general,