| 摘要 |
PURPOSE:To inhibit the crushing of a head, by applying oil extracted from snake bodies to inclined magnetic coatings. CONSTITUTION:Magnetic coatings 2 are formed on a substrate 1 made of Al or the like so that the thickness is made larger at the periphery and smaller at the inside, and layers 3 of oil extracted from snake bodies, that is, snake oil are formed on the surfaces of the coatings 2. |
