machine parts for cranes; namely, tongs for gripping stacks of stones, bricks and building blocks, and component parts for such tongs; namely, spring supported guide rails, spring supported sheet metal guides, joint connectors, universal joints, and height stops for quick adjustment of the plunge depth required, presser rails, steel sprag rails, and inserts for manhole rings; machine parts for cranes; namely, lifting tongs for gripping roof sheeting and roof tile, crane forks, turning forks, ...