What you are looking at is a Hi-Lift jack, made somewhere in the Midwest I believe.I've been looking for a patent for what I believe is commonly called a "farm jack", and can't find one. Searching google patents, I've found similar jacks, but with teeth on an outside rail. I can't find anything with what I would describe as "climbing pins". I don't want to make a jack, I just want to read the patent.
hi-lift.com
Nice -
Bloomfield, IndianaWhat you are looking at is a Hi-Lift jack, made somewhere in the Midwest I believe.
Hi-Lift® Jack Co. | Jacks for Off-Road, Farm, and Rescue
Manufacturer of “The Original Power Tool” Hi-Lift® Jack along with accessories and other recovery related equipment designed for off-road, farm, and rescue.
Looking into their History page, or adding company name, City etc may help find it.
Bingo.