875—73.1 (89A) Purpose and scope. This chapter establishes minimum safety standards for all existing elevators, dumbwaiters, escalators, moving walks and inclined and vertical wheelchair lifts (conveyances not covered by 875—Chapter 72). This chapter shall apply to all conveyances installed prior to January 1, 1975, unless specifically stated otherwise.
	 73.1(1) All existing conveyances installed after December 31, 1974, shall conform with the safety standards (ASME) applicable at the time of installation.
	 73.1(2) Any conveyance which is in compliance with the latest applicable supplements to ASME A17.1, ASME A18.1, ANSI A117.1 or 875—Chapter 72 shall be considered to be in compliance with this chapter if the latest supplement requires safety standards at least equal to or more stringent than the standards adopted at the time of installation, as determined by the labor commissioner.