The Greager and CJB are the same, but being an obsessive I wanted to collect them all. I have another retro Feather on it's way.I've wondered about those myself. I am assuming that they are Chinese knockoffs of the Kai Protouch blades, but I've never been curious enough to buy them and find out.
That is an impressive collection of both genuine and clone AC razors. That vintage Feather is especially rare these days.
It is my understanding that the Greager and CJB are one an the same, other than the logo. I believe they are modeled after the Feather RG.