The Sliding Leg Vise

I've come to realization that in the online woodworking community there are only 3 documented workbenches with sliding leg vises. If there are any more I'd be keen to know.

An old picture. Blogged at Lost Art Press.

Bill Liebold's. Blogged at Popular Woodworking.

Angle iron is used to re-enforce the top.

Jameel (Khalaf) Abraham's Blogged at Khalaf's Oud.
Angle iron on both sides. Big Wooden Vises.