See pics, these clamps are in amazing condition. All (10) mechanical mechanisms work perfectly, like the day the clamps were made. The clamps are shiny and beautiful, literally art, with no rust. These could be displayed as antiques or used by professional woodworkers, metalworkers, cabinet makers, countertop makers, etc. Note that the last pic is one of many examples of how these clamps can be used (not my pic, mine are nicer than these).
These types of clamps are used by professional woodworkers to bring together dowel, spline, mitre, countertop, etc joints while gluing. These clamps are also used by professional welders to hold items in place while welding. You will probably never see clamps like this again.
If you do, they will be rusty garbage.