Someone has an auction on ebay for an advertisement for the Minniehaha machine. Love the name by the way! I hope that you can get a photo loaded and that someone else can supply you with the needed information.
I hope you can get a photo loaded, too. My sister has one but didn't get a chance to see it opened up when I was visiting her several years ago. I had tried to look up some more information back then. When I saw that name I did some more research and Needlebar says that both National and Standard used that name on badged or "stenciled" machines.
Janey - Neat people never make the exciting discoveries I do.