| http://www.w3.org/ns/prov#value | - It will also be noted that, in the figure, there are symbolized by the letter Ai and by large black spots possible locations on the supply network for the oven at which it may be envisaged to vary, according to the invention, the pressure of the gas in order, where necessary, bearing any degradation in the content of the given component of the atmosphere in the chamber 3, for example oxygen.
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