Illinois Compiled Statutes 225 ILCS 705/25.01 – Multi-gas detectors and a barometer, all in proper working condition, …
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Multi-gas detectors and a barometer, all in proper working condition, shall be kept available at each mine for the use of authorized persons. Only permissible multi-gas detectors or air sampling and analysis shall be used for determining the presence of methane and other gases in mine air.