[BRLTTY] Pneumatic braille based on balls in a tube

[timothyhobbs at seznam.cz]

I cannot easilly answer those questions on the pneumatic braille. I am not 
even going to make any promisses about it ever existing. I haven't really 
started designing it yet. There would be no possibility of variations of dot
height. If I ever create the device, software would have to catch up with 
me. Currently, there aren't any screen readers with image support. I just 
wanted to make sure that a technical description was available so that it 
couldn't be patented.