prov:value
| - Groups: A- Atmospheres containing acetylene B- Atmospheres containing hydrogen or gases or vapors of equivalent hazard C- Atmospheres containing ethyl ether vapors, ethylene, or cyclopropane D- Atmospheres containing gasoline, hexane, naphtha, benzine, butane, propane, alcohol, acetone, benzol, or natural gas E- Atmospheres containing metal dust, including aluminum, magnesium, and other metals or
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