| 摘要 |
An adjustable appliance positioning mechanism comprising a standard having a lower base portion, a boom-carrying sleeve pivotally attached to the upper end of said standard, an appliance carrying boom received in said sleeve and longitudinally positionable with respect to said sleeve and a single means for locking said boom against longitudinal motion with respect to said sleeve and for also locking said sleeve against rotational motion with respect to said standard.
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