Singer pretty much went TU around 1990, and the Singer name and a bunch of their divisions were sold off to a Canadian-based company called Semi-Tech Microelectronics run by a young Chinese-Canadian (and reputed in the investment industry to have a lot of mainland China money behind it). Which is probably partly why today you see the Singer name stuck on all sorts of China-made stuff.
That didn't include the missile stuff- I think that became Bicoastal Corp.
Best regards, Spehro Pefhany