At each mine where persons are hoisted in a vertical shaft, an emergency signal shall be provided in such manner that persons can give signals from the cage if the cage is stopped between the top and bottom landings.No operator of a mine shall refuse or neglect to comply with this section.
Emergency signal in vertical shaft
Ohio Rev. Code Ann. § 1567.53, under Chapter 1567 | Mine Equipment; Safety Provisions.
Ohio Rev. Code Ann. § 1567.53