Please switch off lights when leaving sign
Schlüsselwörter
signs,
order,
fire,
blue,
please,
signs,
symbol,
symbol,
white,
control,
switch,
off,
light,
regulation,
environmental,
mandatory,
obligatory,
when,
essential,
important,
necessary,
leaving,
energy,
saving,
money,
power,
electricity
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