aerated
air pollution
alertness
antiradon
attention
budget
building
building activity
calculator
checking
concept
concepts
concrete
concrete casting
construction barrier
construction industry
construction site
costs
crawl space
dangerous
digging
economy
excavation
finance
financial
floor
flooring
focus
foundation
gas
home
lung cancer
magnifier
magnifying glass
money
natural gas
natural ventilation
paving
poisonous
pollution
price
protection
radiation
radioactive contamination
radioactivity
radon
radon test
research
risk
safe
safety
searching
security
soil
surveillance
ventilated
ventilation
定額
Costs about the construction of a ventilated crawl space in an old brick building - Searching gas radon concept with a calculator and magnifying glass.の素材 [FY310172072128]
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