| 摘要 |
<p>1,115,457. Screw propellers. P & O RESEARCH & DEVELOPMENT CO. Ltd. 24 Oct., 1966 [8 Nov., 1965], No. 47257/65. Heading B7V. [Also in Divisions B3, B4 and F2] The hub 5 of a propeller is formed with a recess 12 which reduces stresses in a shaft 2 on which it is secured (see Division F2).</p> |
