Lamps; Germicidal lamps for purifying air; Ultraviolet ray lamps, not for medical purposes; Air diffusers being parts of refrigerators; Plug-in diffusers for air deodorizers ; Air purifying apparatus; Electric air deodorizing apparatus; Sterilizers for medical instruments; Water purification installations; Apparatus for disinfecting water; Disinfectant apparatus for banknotes; Electric room deodorizing units; Combination ozone sanitizer and electric deodorizing units; Sewage treatment plants;...