FIELD: preheaters of various application. SUBSTANCE: resistive heater has a heat-releasing part divided by blind slots with fillets at the ends and having a variable thickness in the zone of fillets. Slots at full length have a constant width, annular bulges coaxial with the filters are made on the heater surface in the zones adjoining the fillets, and the minimum width of the heater in the area of the slot fillets is less than the width of its sections between slots. EFFECT: simplified process of heater manufacture. 2 dwg
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