37 Repair, maintenance and installation of custom industrial equipment for processing lumber, namely, rip saws, crosscut saws, planers, and sanders, lumber distressing and chatter machines, belt and chain transfer units, manufacturing lines for feeding, grading, and sizing lumber, work stations for sizing and grading lumber and locating and removing imperfections in lumber, feeding and stacking equipment for lumber, and conveyors; repair, maintenance and installation of industrial equipment for breaking down lumber, namely, rip saws, chop saws, planers, and sanders, chatter machines, green chain transfer units, manufacturing lines for feeding, grading, and sizing lumber, work stations for sizing and grading lumber and locating and removing imperfections in lumber, feeding and stacking equipment for lumber, and conveyors for others