Those are *MTC Mechanical Ratchet Jacks* - blue heavy-duty ones. Label says "MECHANICAL JACK MTC" with SWL rating.
*What it’s used for:*
1. *Lifting heavy loads* - Railcars, trucks, containers, industrial equipment. You crank the handle, ratchet mechanism lifts in steps. Much more stable than bottle jacks for big weights.
2. *Field work* - No hydraulics, no oil leaks. Works at angles, in dust, rain. "German Technology" on the label = built for rugged use.
3. *Safety first* - Has SWL = Safe Working Load. Always check rating before lifting. Orange warning label on top for a reason.
*Who uses it:* Rail maintenance, truck fleets, construction sites, shipyards, oil rigs. Where you need to lift 5-20 tons safely.