Double ended adjustable wrench

[superzstuff]

All these pictures of "S" shaped versions answered my original question. I remembered seeing a double ender in the 70's, but I thought the ends were turned in different directions. The standard styles, like the one I have, ends are turned in same direction.
Thanks for all the info. Happy to see all the interest.

[mvwcnews]

I ran across a CRESCENT "new product" ad for their double ender line in 1915 ( http://www.flickr.com/photos/mvwcnews/8411934259/ ).  The ad gives their rationale.   CRESCENT TOOL made them in the old heavy line & then in the lighter "CRESTOLOY" line as well.

Beside Crescent, Diamond Calk & Diamalloy, SCHOLLER, GEDORE, possibly hardware wholesaler brands like KEEN KUTTER, there were some odd German made imports in the 20s & early 30's that were just marked with the "maxim opening size" on each end.