" thought Auto-Ordnance just went out of business and ceased to exist"
Well, yes and no.
The REAL Auto Ordnance was started by General John Thompson and investors around 1919, to build and sell the Thompson Submachine gun.
Just before WWII, they sold the company to a man named McGuire, Just in time for HIM to get fabulously wealthy selling Thompson guns to the British and the US during WWII.
In 1945, the Thompson was declared obsolete, and McGuire closed the company down.
In the early 1950's, George Numrich of Numrich Arms and Gun Parts Corporation, bought the company.
Numrich got many of the parts he sold by buying moribund gun companies for their spare parts inventory, and "The Auto Ordnance Company" was just a bunch of crates full of parts, machine jigs, company papers, and some of the experimental and prototype Thompson guns.
Numrich operated Auto Ordnance as really just a brand name, making and repairing Thompson guns, and semi-auto carbines up until the late 1990's when he sold it to Kahr Arms.
So, the Auto Ordnance company really hasn't been a "real" company since about 1945.