There were several different models of roto-brake.
The first was in the 50's and the was just a brake that sat on top of a
rotor. They even gave you a world globe/map option.
The second was in the early 70's and it was like a model 300. Was just
medium duty. Then about 10 years ago they made a fairly heavy duty job.
probably need to find some numbers on something (brake etc) and call
FAQ on WWW: http://www.contesting.com/towertalkfaq.html
Administrative requests: towertalk-REQUEST@contesting.com