| 摘要 |
The actuating knob comprises a body of substantially cylindrical configuration and at least one wing supported on the body for rotation about a substantially parallel axis to the axis of said body. The, at least one wing being positionable at a home position, whereat it is contained within the outline of the body. The, at least one wing also being positionable at an operative position, whereat it protrudes substantially radially from the body to increase the working diameter thereof.
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