機器
agricultural
battery
bearing
bolt
chrome
closeup
construction
cotter
detail
engine
equipment
excavator
farm
farming
fastening
force
grid
holes
hydraulic
industrial
industry
iron
isolated
machinery
mechanics
mechanisms
metal
old
pattern
pinion
power
precision
robust
round
rural
spring
steel
stud
suspension
technical
technology
tire
wheel
workshop
yellow