abstract
air
assembly
backdrop
background
bench
bender
brass
channel
circuit
communication
cooling
copper
engineer
engineering
equipment
fitter
fitting
flaring
hose
industry
instrument
line
locksmith
manufacturing
measurement
metal
montage
mounting
pipe
pipeline
pipework
piping
plumbing
rammer
system
table
tool
tube
tubing
water
work
workbench
workspace