37 Insecticide spraying for residential homes; insecticide spraying for commercial buildings; pest control; fumigation of buildings against vermin activity; extermination, disinfection and pest control; vermin exterminating, other than for agriculture, aquaculture, horticulture and forestry; vermin exterminating [other than for agriculture, forestry or horticulture]; pest control relating to buildings; pest control for residential homes; pest control services, other than for agriculture, horticulture and forestry; pest control services, other than for agriculture, aquaculture, horticulture and forestry; servicing of machine tools; installation of pipe systems for conducting of liquids; plumbing maintenance advisory services; plumbing repair advisory services; machinery installation, maintenance and repair; plumbing installation, maintenance and repair; plant maintenance; plant refurbishment; installation of plant (term considered linguistically incorrect by the International Bureau - Rule 13 (2) (b) of the Regulations).