R-B International- 1.5-RB, 2.5-RB & 2.8-RB mini excavators

[IBH]

R-B International, for a short time in the late 1990's (?) offered three models of mini-excavator for sale, apparently sourced from 'Beat Maurer' of Switzerland- the 1.5-RB, 2.5-RB & 2.8-RB.
I've managed to find images of all three models, but now nothing else about them or 'Beat Maurer'.

Edit: Can't get image uploads to work, will upload images asap.