The word "Dreadnaught" was applied to large battleships just prior to World War One, to suggest that such powerful behemoths feared NOTHING on earth. Thus, there was a car manufactured in the teens called a "Dreadnaught Moline". Moline, Illinois was famous as a manufacturing center for high quality, heavy duty steel products, and I think there was a company called "Moline Steel" or such (I think the owner there was the guy who first created "Buddy L" steel toy trucks, for example). Anyway, I'll bet that the "Dreadnaught" name on those wrenches was there to imply their toughness, and they might have been made by Moline.