I don't know if there's even enough info on the box. I think Attache is just their product name (since it's in a plastic suitcase) not the brand, although it should be unique. Since it's not coming up in searches, it must be quite rare. And that number might even just be a serial number. It says 200 projects so "200 in one" is another piece of info. The only other piece of info is that it's made in japan. So I think we're just going to have to look through Japanese elecrtronics companys that exported to Canada in the 1970s and see if they made lab kits. If 2982 is actually the serial number, then it is quite rare.
Edit: Gakken kits were (and are) made in Japan, but so was a lot of stuff back then.
EDIT2: Definately not a Gakken, most of theirs were under the "Mykit" branding, and they definately wouldn't hide their brand name. This may or may not be a genaric no-name lab, which would make it suprising that they actually bothered to give it a name like "attache".