. . "pment; engines; pipes; pumps; tanks; motors; conduits; switchboards, plumbing, lifting, cleaning, fire prevention, fire extinguishing, and any other safety equipment required by governmental regulation or law, refrigerating, ventilating, and communications apparatus; all gas and electric fixtures, radiators, heaters, boilers, ranges, plumbing and heating fixtures, furnaces, oil burners, or units t" . .