Your assumption that i meant the volume of all their sales is off base. I guess i need to simplify/ clarify what I meant. There used to be a special account that airgas had for all glassworkers called "glassblowers unlt." They might or might not be keeping track of glass related gas sales..I mentioned glasses too for a reason. If someone wanted to do a REAL estimate based on empirical data they should look to items that are universally used as a sort of gauge. Most people work off tanks, have glasses, a torch etc. If you were a statititian looking at the volume of sales of materials might be a good starting point for getting some data. If you want to nitpick the numbers add a +- with a chance of error at the end.

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