Cleaning apparatus for industrial purposes; Cleaning machines for industrial installations; Filters for industrial purposes; Industrial blowers; Industrial cleaning apparatus for cleaning boilers; Industrial cleaning machines; Industrial cleaning machines (vacuum cleaners); Industrial floor cleaning machines; Industrial vacuum machines for cleaning; Suction apparatus for industrial purposes; Suction apparatus for industrial purposes for the removal of liquid; Suction apparatus for industrial use in the removal of dust; Suction machines for industrial purposes; Vacuum cleaners for industrial purposes; Vacuum operated apparatus for industrial purposes