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Publication of JPH01171621UpublicationCriticalpatent/JPH01171621U/ja
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Publication of JPH0453934Y2publicationCriticalpatent/JPH0453934Y2/ja
An electric thermal unit for controllably heating cylinders in extruders and injection presses for plastic materials, rubber drawing machines, and the like apparata, having two coaxial interspaces for circulating ventilation air therethrough