| 摘要 |
<p>The cover is made all of a piece of a suitable plastic material and is available in various colors, providing a color code for a quick recognition of the particular kind of nipple and facilitating an easy detection of a partly hidden piece. The cover can be repeatedly folded open and closed without getting damaged. The invasion of dust, contaminated grease, and water, causing corrosion at the bearing involved is avoided.</p> |
