The gemini was a B4 scrambler, this info was posted up by member "Ding Ding" a little while back
Puma were identical, Pretty sure they weren't marked as Gemini across the seat though, a few companies were getting the bikes an selling them
The Puma version was called and S-400 The puma lineup was the same SST made mini bikes as Gemini.
I think they probably sold them roughly 1971-1974 like that, as rollers and fully loaded. A company called auranthetic had them converted and turned into electric bikes around 1973-1974.....I would imagine that shin sang tong was offering them for a song be rid of them at that point so they were affordable to use as a base for them to build from.