機器
ammeter
ampere
analog
antique
background
black
board
closeup
construction
control
cubicle
current
device
dirty
display
electric
electrical
electrician
electricity
electronic
energy
engineering
equipment
factory
gauge
industrial
industry
instrument
isolated
machinery
manufacturing
measurement
meter
number
object
old
panel
plant
power
professional
retro
scale
switch
system
technology
tool
voltage
voltmeter
white