Nokia C110 User Manual page 57

Areas with a potentially explosive atmosphere are often but not always clearly
marked. These include the area below deck on boats; chemical transfer or storage
facilities; vehicles using liquefied petroleum gas (such as propane or butane); areas
where the air contains chemicals or particles, such as grain, dust, or metal
powders; and any other area where you would normally be advised to turn off
your vehicle engine.
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