Today, examining home photos I saw in the background an old mouse BMS. Since the quality of the photo of the mouse there is inappropriate, I found her photo on the Internet. Young people did not seem to see such a miracle - I think many will be curious The Soviet mouse, if I am not mistaken, was called BCM, it weighed at least half a kilogram, unless of course my memory serves me.
Graphic Information Manipulator EC 1841 A special feature is a steel non-rubberized ball, if I remember correctly one and a half times more than usual.
Because of such a ball, the mouse rolled perfectly on any surface ... The mouse sounded especially wonderful on a varnished table. ')
And what was your first mouse?