I have a pile of these old hex drive sockets and "L" bars from several different manufacturers.
That being said, I hadn't really seen much in the way of them actually being used in old photos or manuals.
I was given an old engine a few weeks ago, and while looking at reference material on it, found this in the manual....thought it was kind of interesting to actually see one depicted in use!!!
I know, not groundbreaking, but I thought it was cool from a "younguns" perspective!!!