Plyerman,
Just an observation, but the Stolar combination tool looks like a forerunner of the modern fence plier. I'm sure there were many incremental innovations between 1930 and today. But, it would be interesting to trace the history of the modern fence plier back thru the patent records, tool catalogs, trade journals, and print advertising. I'll bet there is an interesting story there....
For the record, I've run a landscaping business for the last 8 years, and the modern fence plier has been an indispensable part of my tool and equipment work set. It is one handy multi-tool.