What is this? Help with IDing a fixed garage floor jack thingy

ablank135

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I'm stumped on this one. I'm helping a neighbor look at repairing a house with a two-car detached garage. Around 2000, the previous owner installed what appears to be a fixed/sunken jack or hydraulic lift base in the center of the garage floor to do some sort of auto repair (the intent and use is unknown). Looks like they poured new concrete around the metal base, sloping it up on four sides from the original slab (or in place of). All that's left is what's in the photo--a ring with bolt holes in the perimeter and one large bolt (attaching it to something below) at the center. There was some powdered material that ringed around the center bolt that might have been a pad, but no way to tell. There's a 2"-diameter sunken bolt just to the side that looks like you'd either crank it or maybe release pressure (?). Foot included for scale.

Anyone come across these before? Suspect there's hydraulics in there? Just mechanics/gears? If it was truly a lift/piston, there are no other attachments in the garage. I'm going back over with penetrating oil and a breaker bar, but I'd love to know the model of this thing before I start snooping.

I eagerly await your collective brilliance.
 

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