| 摘要 |
A roof bolter (10) comprising combined means (22) for drilling and resin bolting with the roof bolter in one operative position, means (24) for bolt inserting with the roof bolter in a second operative position, and means (26) for positioning the roof bolter first into this one and then into its second operative positions. …<??>The invention also provides a device designed for attachment to a three-position resin type roof bolter and converting it to a two-position resin type roof bolter. |
