機器
architectural
biginch
building
civil
conduit
construction
crane
development
energy
engineering
environment
equipment
fitting
gas
gasoline
gaspipeline
heavy industry
industry
largediameter
line
metal
natural
oil
operations
petroleum
pipe
pipe lining
pipelaying
pipeline
pipelining
piping
power
pressure
structural
supply
technique
technology
transfer
transmission
transport
transportation
trunk
tube
tubing
working
定額
Gas and oil pipeline construction. Pipes welded together. Big pipeline is under construction. Cloudy skyの素材 [FY310193070484]
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