| 摘要 |
<p>778,679. Making heat exchange elements; extruding. BROWN FINTUBE CO. Oct. 14, 1955 [Nov. 26, 1954], No. 29332/55. Classes 83 (2) and 83 (4). [Also in Group XIII] A tubular heat exchange element comprising a main conduit 12 and an auxiliary conduit 13 separated by a common wall 11 having fins 15 thereon, is formed by extrusion from aluminium or other metal.</p> |
