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单词 screw key
例句 screw key
A sufficient number of wooden presses, pressing boards in folio, quarto, and octavo, with the screw key, as well as the press jack belonging thereto, must be conveniently placed. Practical Bookbinding 2012-04-02T02:00:23.047Z
The pinions are arranged so that they can be worked with the same screw key that is used for the bolts in the circular grooves. Mechanical Drawing Self-Taught
The screw key is used when applying heavy pressure; the press jack serves as a support during certain work which necessitates laying the press on the edge of the bench. Practical Bookbinding 2012-04-02T02:00:23.047Z
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