Industrial robots; underwater industrial robots; robots for maintaining, cleaning and polishing the walls and windows of aquatic pools and aquariums, in submerged and dry conditions; Underwater installations and apparatus for maintenance, upkeep and repair of glass in aquatic pools and aquariums, namely, cleaning machines for glass in aquatic pools and aquariums, glass-working machines, glass-repairing machines; Electronic ultrasonic cleaning units for glass and glass-substitutes in aquatic p...