| 摘要 |
1,154,941. Making cable trays. LOCKER PERFORATORS & WEAVERS Ltd. 9 May, 1967 [10 May, 1966], No. 20606/66. Heading B3A. [Also in Division H2] A sheet metal cable tray is made by perforating a steel sheet to form sets of obliquely extending ribs 6, 7 and thereafter flanging 2 along one pair of opposed sides. The apertures 4 are preferably parallelogram shaped but may be oval. |
