Air filters for industrial and household use; ambient air heating, ventilating, air conditioning and purification apparatus; air purifiers; electric air deodorizers; filters for air purifiers; air purifying apparatus, namely, apparatus for filtering pollen from the air; air purifying apparatus, namely, dust filters; air purifying apparatus, namely dust cyclone filters; air filters for use as dust arrestants in industrial processes; air filters for use as dust extractors in industrial processe...