With {TAIL ~ door} 54 and cover 14 in their closed position, as shown in FIG 3., a substantially air tight chamber 56 is formed in the interior of {HEAD ~ kiln} 10 
With { TAIL ~ door } 54 and cover 14 in their closed position , as shown in FIG 3 . , a substantially air tight chamber 56 is formed in the interior of { HEAD ~ kiln } 10
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