Around 1989, Strippit Finally got around to Upgrading their Workclamp Designs.
The Old Pivoting Type that Strippit had used since 1970, was an Ancient Copy of 1960's Wiedemann Workclamps. The Problem with this Type of Workclamp was that the Gripping-Jaws Traveled in a Arc as Clamp Moved Up & Down, so the Gripped Work-Sheet was Never Parallel to Support-Tables or Punch Dies, which Lead to Tooling Punch-Marks on Parts, or even Part Jam-Ups in Turret.
New Workclamps were Similar to the Amada Design, in that the Clamp-Body was in Bearing-Guides that allowed it to Move Straight Up & Down, keeping the Workclamp & Gripped-Worksheet Parallel to Support Tables & Tooling, leading to Higher Quality Parts with Better Accuracy, Less Marking, & Less Jams-Ups.