I don't know anything about these in particular, but the "mini"s were generally designed for women to shave their underarms*, not as travel razors, per se, as might be suspected initially.
* somewhere around here there are pics of a round (sorta open flower shaped) razor for this purpose also.
edit: iirc, they all took proprietary blades which are also no longer made. Though, I suppose it would be possible to take an old one and rehone it if someone wanted to give it a go.
-- Richard, Czar of Cheddar