| 摘要 |
The invention relates to a powder application device having a cylindrical outer casing in which is telescoped a cylindrical inner casing. One end of the outer casing is closed by a transverse wall and the opposed end of the inner casing is also closed by a transverse wall having a central opening controlled by a valve. The other end of the inner casing has a transverse wall having a central opening which is also controlled by a valve. |
