Section R. 408.12206 - Definitions; M to PRule 2206.
(1) "Mast" means a support member providing the guideways permitting vertical movement of the carriage. It is usually constructed in the form of channels or similar sections and provides the supporting pathway for the carriage rollers.(2) "Nonagricultural operations" means work activity other than that designated in major groups 01 and 02, that is, agricultural production of crops and livestock of the standard industrial classification manual, United States bureau of the budget, 1972 edition, and includes any practices other than those performed by a farmer, or on a farm, as an incident to, or in conjunction with, such farming operations. Examples of nonagricultural operations are landscaping, groundskeeping, roadway maintenance, construction services, loading, and digging.(3) "Operator" means an employee who has been trained and authorized by the employer or his designated representative to operate a tractor.(4) "Overhead guard" means a framework fitted to a tractor over the head of a riding operator to protect the operator from falling objects.(5) "Parking brake" means a device to prevent the movement of a parked tractor.Mich. Admin. Code R. 408.12206