| http://www.w3.org/ns/prov#value | - Dangerous Accumulation of Gases. (a) When the air in any part of a mine is known to contain, or is suspected of containing, a dangerous accumulation of gas, it shall be tested before anyone is allowed to work therein.(b) For the purpose of these Orders, a dangerous accumulation of gas is any gas, except flammable gas, in a concentration greater than listed in the General Industry Safety Orders as
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