In the early 70's, I was running an Archdale radial arm drill for a manufacturer in Eugene Oregon. They had a pair of clamps on the table. About 10 inches tall. Long T bolt vertically through the middle. Had a rear projection at the bottom about 4 inches long with a flat foot, and an upper projection about4 inches long that had an acme thread screw with a swivel foot (like a c-clamp). Sweet clamps---just slide down the t-slot, pivot the screw over the work. As the screw tightened it rocked back on the foot and things got held down.
These were cast, in the style of a cast c-clamp. NOT something that was machined or fabricated by the company.
I want a pair of them for an old Asquith drill I'm setting up in a repair shop---but I can't find them, or even really know what to call them!! Anybody have any ideas?