Class 011
Environmental Control Instrument Products (lighting,heating,cooling,cooking)
Class 019
Non-Metallic Building Material Products
Furnaces, muffles, kilns, ovens, driers, fuel burning equipment, combustion chambers, lehrs and parts thereof, refractory of non- metallic heat resistant bricks, tiles, blocks, forms and linings and bulk materials for the manufacture thereof, heat exchangers, regenerators, recuperators and parts thereof, cements, particularly refractory and heat resistant cements and compositions, metallurgical furnaces and parts thereof, by-product coke ovens and parts thereof, electric furnaces and parts thereof, and miscellaneous refractory installations subjected to mechanical or flame abrasion or requiring mechanical strength at high temperatures, and installations where non-metallic refractories are required to transmit heat.