; (v) the constructing, repairing and maintaining of roads or camps used in connection with logging; the constructing, repairing, and maintenance of machinery or equipment used in logging; and (vi) other work performed in connection with logging; and (B) does not include the manual use of chain saws to fell and process timber and the use of cable skidders to bring the timber to the landing. (2) Mechanized operation — (A) means the felling, skidding, yarding, loading and processing of timber by equipment other than manually operated chainsaws and cable skidders; and (B) includes whole tree processors, cut-to-length processors, stroke boom delimbers, wheeled and track feller-bunchers, pull thru delimbers, wheeled and track forwarders, chippers, grinders, mechanical debarkers, wheeled and track grapple skidders, yarders, bulldozers, excavators, and log loaders. ; and (2) in section 13(c) ( 29 U.S.C. 211(c) ), by adding at the end the following: (8) The provisions of section 12 relating to child labor shall apply to an employee who is 16 or 17 years old employed in a logging or mechanized operation in an occupation that the Secretary of Labor finds and declares to be particularly hazardous for the employment of children ages 16 or 17, except where such employee is employed by his parent or by a person standing in the place of his parent in a logging or mechanized operation owned or operated by such parent or person. . B Oregon and California Railroad Grant Lands and Coos Bay Wagon Road Grant Lands 911. Amendments to the Act of August 28, 1937 The Act of August 28, 1937 (50 Stat. 874), is amended— (1) by striking principal of sustained yield and inserting principle of sustained yield ; (2) by striking facilties and inserting facilities