Here is another odd wrench. It is a 6point/1/2'' key wrench with Thomas A. Edison Inc. on the shank. Anybody have info on this?
Hi Bob. I don't have any info on that T-handle hex key wrench in particular, but I do have some Edison tools, including an ignition wrench (excuse the glare)...
...made by Bonney Forge and Tool. (That's a Bonney date code)
I also have an Edison Spark Plug Socket Wrench Set (made by Duro-Indestro)
And I do have some information you may find useful and interesting.
Thomas A. Edison, Incorporated, located in West Orange, NJ, was a parent company with all kinds of subsidiaries in all kinds of markets. If you didn't already know it, the diversity of Edison's inventions (including the first acetate based sound recordings and "movie" film) is equal only to the aggressiveness of his capital approach. He was never the science-for-science's-sake kind of guy. His "lab" was actually a multi-building campus, including two large manufacturing facilities, where magnetoes, spark plugs, and all kinds of batteries were made. All of the buildings and much of the equipment have been preserved in place and turned into a spectacular National Historic Park and museum. Well worth the visit if you're ever in the area or passing through.
To return to the subject... I have never seen a tool that wasn't related to automotive electrical systems, but your T-wrench is pretty large for that work, so I don't know. It may have just been part of the plant's tools. Cool wrench, either way.