The chamber may, however, be leaky to allow the sealing members previously described to operate as one way valves which would then prevent exterior air from entering into chamber 56 during {HEAD ~ firing} of {TAIL ~ the ceramic ware} 
The chamber may , however , be leaky to allow the sealing members previously described to operate as one way valves which would then prevent exterior air from entering into chamber 56 during { HEAD ~ firing } of { TAIL ~ the ceramic ware }
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