-Construction : duct, piping, metal stairs, machine room,
elevator, air-conditioning room, singing room, bowling alley,
parking tower, sealing, etc.
-Transportation: automobile, train, subway, express bus, etc.
-Electric appliances/OA: washing machine, microwave oven,
fan heater, computer, TV, CD player, speaker, air-conditioner,
audio, printer, copier, etc.
"-Others: sports and leisure
"