| 摘要 |
<p>1,172,605. Working stone. YTONG INTERNATIONAL A.B. 12 Oct., 1967 [4 Nov., 1966], No. 46680/67. Heading B5E. A device for removing irregularities from the surfaces of e.g. moulded blocks of lightweight concrete comprises a shaft 11 having secured thereto spaced plates 12 over which are stretched wires 18, 19, 20, 21, 22, 28, 29, 30, the wires being pulled radially inwardly by means of hooks 27 secured to plates 26. The plates and hooks may be replaced by bands.</p> |
