we have a decent amount of evidence that Northrop Grumman's B-2 stealth bomber actually uses Townsend Brown's principles.
When Odlem made his investment in Brown in the 60s, he was a majority owner of Northrop before its merger with Grumman.
And the B-2 was built by the merged Northrop Grumman, whose major investor Floyd Odlem was the same guy that invested in Townsend Brown's company Guidance Technologies in the 60s.