| 摘要 |
The present base for a drawing or drafting board or the like supports the board so that the latter is adjustable in the three directions of space. After each adjustment the board may be locked in the adjusted position by a respective safety or locking device. These safety or locking devices are so arranged and constructed that a yielding is provided in response to the reaching of a load limit applied to the drawing or drafting board whereby damage to the board and its supporting structure is avoided.
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