Posted by AADIVER on March 23, 2001 at 11:00:29:
In Reply to: Re: Why not 40% O2 and 60% He? posted by MHK on March 23, 2001 at 09:33:26:
Agreed. I queried JH on the date in June he'll be conducting a tri-mix course at his "toy shop", no reply yet.