I going to give my best shot to describe what the tools do as I understand them. No need for electric for any of these tools just some compressed air. Corrections welcome.
This riveter is for reaching inside tanks or boilers. The tool hangs from an overhead hoist from the L shaped arm with the big chain on it. The wheel located in the middle allows the operator to spin the jaws around in a circle to position the riveting gun and buck on the work piece. The large air piston at the back clamps the tool on the rivet. In operation you would position the tool with the buck on one side of the work piece and the air hammer on the other side, place a rivet in the hole, clamp the tool down on the rivet and work piece, and the operate the air hammer to complete the rivet process.
Air hammer and buck
The round cylinder with the air line is the piston for clamping the tool down.
The big chain and bracket is for hanging the tool from an overhead hoist and the wheel rotates the tool around inside the ring the lifting arm is attached to.