“Giving structural steel a protective rust­proof and fireproof coating, without the use of forms … Lining tunnels, dry earth walls, irrigation ditches, etc. with a waterproof protective coating … Coating wood piles to protect them from destructive sea insects … Waterproofing concrete dams and reservoirs … Repairing defective concrete sea walls … And, coating frame houses, fac-tory curtain and inclosing walls, waterproof­ing, etc.”