The bellows 46 is preferably {HEAD ~ stainless steel} or {TAIL ~ other oxidation resistant alloy}, so that it resides inside the oven 24 
The bellows 46 is preferably { HEAD ~ stainless steel } or { TAIL ~ other oxidation resistant alloy } , so that it resides inside the oven 24
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH