| 摘要 |
883,281. Doors. COMMISSARIAT A L'ENERGIE ATOMIQUE. May 1, 1959 [May 6, 1958], No. 14935/59. Class 20(3) [Also in Groups XXV and XXXIV] Each member of a pair of heavy doors, e.g. for a vault containing radioactive material, is provided with a hydraulic system for lubricating the hinges and withdrawing the bolts (see Group XXV) and comprises a framework of U-beams 21-26 covered on both sides by sheet metal plates 27 and lined with cast lead 29. A dust seal 35 is provided. |
