MSHA - Code of Federal Regulations - 30 CFR 57.19018
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MSHA - Title 30 CFR
30 CFR § 57.19018
Overtravel by-pass switches.

When an overtravel by-pass switch is installed, the switch shall function so as to allow the conveyance to be moved through the overtravel position when the switch is held in the closed position by the hoistman. The overtravel by-pass switch shall return automatically to the open position when released by the hoistman.