ZTE Blade A430 - Manual (Page 125)

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Areas with potentially explosive atmospheres include fueling
areas, below decks on boats, fuel or chemical transfer or storage
facilities, and areas where the air contains chemicals or particles,
such as grain, dust, or metal powders.
Blasting Caps and Areas
Power off your mobile phone or wireless device when in a
blasting area or in areas posted power off “two-way radios” or
“electronic devices” to avoid interfering with blasting operations.