| 摘要 |
<p>323,968. Marks, Sir G. C., (Ingersoll- Rand Co.). March 11, 1929. Percussive tools. - A sleeve S, formed with a longitudinal split, surrounds the exhaust ports E of the drill so that the exhaust air is diffused in passing into the atmosphere. It is held in position by its own spring pressure on the surfaces V, X and endwise movement is prevented by the shoulders W, Y. Specification 316,470 is referred to.</p> |
