| 摘要 |
485,471. Switch covers. TUCKER & CO., Ltd., J. H., MACBETH, C., and AVISON, R.G. Nov. 21, 1936, No. 31895. [Class 38 (v)] [Also in Group XXXVI] The cover-plate of a flush-mounted switch is made of convex formation so that. when applied to a wall, the corners c remain in contact with the wall even after the mounting ring (not shown) has been tightened. The material of the plate is made to taper from the centre towards a peripheral fiange e which is roughened to increase friction with the wall. |
