Overhead crane including a single failure proof hoist

Overhead crane including grapple means

Overhead crane with lifting beam provided with C-shaped claws

Overhead hoist transfer

Overhead support system

Overhead traveling crane system

Overhead travelling carriage

Overhead travelling carriage

Overload control for lifting boom

Overrunning yoke self-loading carrier

Panel turner for gantry crane

Pickup truck derrick

Pipe bundle key

Pipe laying crane

Pipe laying machines

Platform crane with counterweight and boom carrier support linka

Polar wye crane

Portable crane with hoist mounting and outrigger support apparat

Portable hydraulic hoist for vehicular engines

Portable overhead crane and method of installing it