11 WHIRLPOOL BATHTUBS, PORTABLE WHIRLPOOL SPAS IN THE NATURE OF HEATED POOLS, INGROUND WHIRLPOOL SPAS IN THE NATURE OF HEATED POOLS, COMBINATION WHIRLPOOL BATHTUBS, STEAM BATHS AND SHOWERS, COMBINATION WHIRLPOOL BATHTUBS AND SHOWERS, STEAM GENERATORS AND STEAM HEADS