I can't find any information on this German tool maker which, like Hoppe, clearly made a wide variety of tools.
I did pick up a 3/4" brad-point drill bit made by Mibro and packaged by the long defunct Beaver Lumber chain, so obviously at one point they were available through these Canadian hardware stores.
Of interest, all of the taps and most of the dies in my Mibro set are marked "Steer" and many are marked "Austria."
So, was "Mibro" a brand of "Steer" (or vice-versa) or was Mibro like Sears, a retailer that sold various tools under its own name?
There is a Canadian tool company by this name, but I don't think it's the same. All its website reports is that it has been around for more than 60 years. To its credit, that company is one of the sponsors of the Toronto Tool Library.
Since posting this, a received an email from Steve, a regular visitor, pointing out that the Mibro hacksaw frame bore a strong resemblance to his Eclipse 20T frame. So, I took a photo of the Mibro, my 20T, and another frame simply marked "Made in Sheffield" and "516":
They are indeed very similar, although the "ears" on the handle of the Mibro are sharper than on the two other frames. So, maybe there was some connection between the firms, or maybe it's just design convergence.