Global Specialities 6000 Frequency counter

[DmitryL]

Hello everyone.
I got this ancient frequency counter in half-working condition. It is based on LS7031 and some small logic chips.
I want to fix it just out of curiosity, but I don't have schematics. In theory it is possible to reverse-engineer it, but it would be to much for such low-end thing.
Does anyone have a schematics/manual for this thing ?

[Vgkid]

Google does not return anything, here is their contact info.
mailto:   tech@globalspecialties.com