I have a couple of them that look like yours (I don't have a rational reason for buying the second one). I think one, maybe both of them may be marked Snell. I know several auger bits made for them that I have are marked Snell. Search using "boring machines," or "beam boring machines." and you can probably find quite a bit of information. For those that are want one, there are timber frame web sites that sell speciality antique tools like slicks, spuds, boring machines and auger bits, but they're pretty pricey. If you can find a woodworking tool collector's estate auction, you may find several (where I found one of mine). Of course, there's always the popular on-line auction. I'd bet there are some there.