Salvaged some old EMT for reuse with some tool-free connectors that turn out to be quite neat to use--they're similar in appearance to a pipe fitting solder connector with just a couple of dimples pressed into the barrel on each end. In use, you simply drive the conduit in and it's there; not compression nuts to tighten nor the ugly external screws in the screw-type.
Anyway, the question -- anybody seen these or know a source? I quick search didn't uncover them; I can't make out a manufacturer mark more than an uppercase 'M' and a patent-pending to try to identify...
I'm liking them a lot but there are only a bare few around from some old scraps...these may date from the '60s; I've no way to know...