Metal hardening. The process of hardening metal.
Schlüsselwörter
hardening,
process,
metal,
old,
wheel,
transportation,
transport,
engine,
car,
steam,
vintage,
train,
city,
wall,
cycle,
technology,
steel,
industry,
street,
locomotive,
red,
wheel,
retro,
work,
equipment,
industrial,
men at work,
construction,
machine,
tool,
hand,
power,
safety,
man,
light,
factory,
electric,
vehicle,
automobile,
iron,
cut,
engineering,
bike,
bicycle
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