Heating device
 A heating device, comprising a tubular body whose inner wall bounds a heating chamber for objects. Between the inner wall and the outer wall of this body a plurality of ducts is provided which are situated in a ring-shape about the heating chamber and which extend parallel to the tube axis. These ducts are separated from each other by rigid partitions. Each duct contains evaporable heat transport medium. 
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inventional additional inventional
Pieter Aart George Albert Apolonia Jacob Willem David Bruce Adrianus Petrus Johannes
Naastepad Asselman De Ruiter Green Castelijns