| 摘要 |
PCT No. PCT/GB89/00767 Sec. 371 Date Jan. 7, 1991 Sec. 102(e) Date Jan. 7, 1991 PCT Filed Jul. 6, 1989 PCT Pub. No. WO90/00665 PCT Pub. Date Jan. 25, 1990.A device for supporting the lower ends of ladder stiles on unlevel ground comprises a flat flexible mat (7) having at one end a ramp portion (1). In use, one stile rests on the flat mat and the other rests, at an appropriate height on the ramp portion, which faces the wall against which the ladder leans. |
