| 摘要 |
<p>755,434. Toughened glass insulators. PILKINGTON BROS., Ltd. Jan. 27, 1955 [Feb. 11, 1954], No. 4107/54. Class 56 In the manufacture of a pressed toughened glass insulator for supporting power cables and having a hollow head 1 and integral skirt 6 the heat is partially extracted rapidly from the annular portion 8 (e.g. by forced air jets 16, 17, 18) before the. rapid chilling of the whole of the outer and inner surfaces.</p> |
