| 摘要 |
<p>A passage for cooling medium has been provided in a channel (2), closed with a back cover (3) and face covers (4), and filled up with a metal of the plate (1) so that the back cover (3) is free from the metal of the plate (1). Connections (5) for supplying cooling medium to the passage and outlet of said cooling medium from the pasage have been arranged on the back cover (3).</p> |
