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Installation, maintenance, repair, and alteration of refrigeration systems and related appurtenances.
Installation, maintenance, repair, fabrication, the alteration, and extension of air conditioning, refrigeration, heating, ventilation systems, duct systems, warm air systems, low-pressure boiler, and unfired pressure vessel systems, solar heating and cooling systems.
Installation, repair, alteration, and maintenance of electric conductors, raceways, and equipment for light, heat, and power.
Installation, repair, alteration, and maintenance of electric conductors, raceways, and equipment for light, heat, and power in one-, two-, and three-family dwellings.
Installation, maintenance, repair, fabrication, alteration, and extension of air conditioning, refrigeration, piping vessels, warm air heating, low and high-pressure boilers, ventilation systems, duct systems, insulation, and related appurtenances within a complete system unlimited in horsepower or tonnage.
Installation, maintenance, repair, alteration, and extension of residential air conditioning systems.
Installation, maintenance, repair, and alteration of steam and hot water boilers, including both low and high-pressure boilers, related piping vessels, and related appurtenances.
Installation, maintenance, repair, and alteration of refrigeration systems and related appurtenances intended to be used for the purpose of food and product preservation, unlimited in tonnage or horsepower.