21 Electric diffusers for air fragrancing preparations; non-electric diffusers for air fragrancing preparations; plates for diffusing aromatic oil; plug-in diffusers for aromatic oils; non-electric aromatherapy oil diffusers, other than reed diffusers; electric aromatherapy oil diffusers; tealight essential oil diffusers; fragrance oil burners; electric perfume burners; non-electric perfume burners