| 摘要 |
A system for providing a visual body length indicator for a group of mine roof stabilisers (1) of various, unique lengths includes providing each stabiliser with a tubular body (3) and a slot (11) along the body. A bottom annular ring (20) having a ring gap (26) formed therein is attached to the body, with the ring gap and body slot being orientated in a unique relation for each unique body length, providing a visual indicator of body length that can be observed from a distance, even after the stabiliser is installed into a drill hole in a mine roof. <IMAGE> <IMAGE> |
