The accident with the 12 ton part was partly the workers part. The crew had welded a lifting lug on a 2:1 elliptical head to pick it up. The metal the lug was made out of was too thin, the shackle pulled through the metal dropping the part on a man.
The accident with the 7 ton part was due to the company removing part of a support leg on a turntable. The legs retruding in front of the turntable had been shorted by about a foot. This was so the device could be moved closer to another machine.
When the weight of the object on the turntable was calculated, the engineer forgot to figure in for the shortened legs.
The guy had the part on a vertical position, the table and part flipped forward pinning the man against a metal beam.
This is what a turntable looks like.