BRG was whatever a manufacturer thought it should be. See
http://mywebpages.comcast.net/
Regarding QR hubs, I have asked before exactly what Campagnolo made in the early days. Did they buy in the hubs and make the axles and skewers? Or where they also contracted out? There must have been a point at which they became a manufacturer with a factory rather than a workshop for making prototypes. If this is in the Timeline, Chuck, I apologise. I couldn't find it.
Stuart Tallack in West Sussex