Kracky wrote:

this site has a great illustration
of tunnel boring equipment , for
example .....

http://www.brainstrain.subterrene.iwarp.com/

I saw all but one of those links is 404 or SK. And one
of the active ones has nothing to do with boring.


Lumpy
-- 
In Your Ears for 40 Years
www.lumpymusic.com