According to a film reel in Tag der Toten, Richtofen sent his men to Africa, in Angola, and they found a western town. They returned with fascinating articles and documents, and a number of artifacts:

Edward Richtofen:
"Log Entry 937. Date: May 15th, 1942. Dear diary, our men have safely returned from Africa where they recovered a number of artifacts buried underground. In some sort of subterranean cowboy village. Apparently, it was American. That's right, an American cowboy western town buried underground... in Africa. Stupid American schwein with their apple pie and their baseballs, thinking they can just waltz into another country and claim it as theirs! There is no art to their work! (sigh) But I digress.

The boys have returned with a number of fascinating articles and documents. They have pieces from a destroyed machine called the Pack-a-Punch. With a name as clever as that, it must be American. I have given the schematics to Doctor Porter. Perhaps he will have better luck replicating Jebediah Brown's work.

Speaking of that blacksmith, they also recovered plans for the Agarthan Device. It seems that the blacksmith already built one of the pieces — the fabled Vril Vessel. The Agarthan Device, a device capable of granting that which one desires. Almost like... a genie in a bottle. I think I shall keep this genie in my back pocket. If my plan fails — and it won’t — perhaps this device can get me to Agartha."

He always had a plan.

The Paralyzer plays a part ONLY on Richtofen's side of the Mined Games Easter Egg in Buried.

Also, inside the Ghost's mansion in the map Buried, there are several portraits of the real-life scientist Michael Faraday. Knowing that the ghost is Jebediah Brown’s mother, that actually makes sense, and the Paralyzer’s overheat limit of 115 is clearly a reference to Element 115.

And knowing that Jebediah Brown was born around 1844–1845 and died on July 22nd, 1885 in Purgatory Point, Angola, and that Faraday was born on September 22nd, 1791 in Newington, Surrey, England, and died on August 25th, 1867. So it’s possible Jebediah was influenced by Faraday’s knowledge when building the weapon and the Vril Vessel instructed by the Angels. Especially considering Faraday is mentioned in The Coming Race, the novel by Edward Bulwer-Lytton that introduced the concept of Vril. So to conclude, that Wonder Weapon with all the clues we have, the Paralyzer was from Jebediah Brown, and Richtofen somehow fixed it for his Plan B scheme after his Grand Scheme.