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Well the tiny bubbles make a head that looks amazing similar to the draught served Guiness - I am impressed. I hope some engineer got some nice money from that invention. Or maybe he drank all the profits testing it....hmmm. <img src="/ubbthreads/images/graemlins/smile.gif" alt="" />
It is exactly the same. Guiness uses a N beer engine in thier draft.

Horned, dangerous, and off my medication.