| 摘要 |
The present invention is a steelworker's layout tool for use in laying out the bolt and weld patterns used to connect steel structural members and in fitting up these members. Preferred embodiments of the present invention comprise parallel arms which are spaced apart at distances which correspond to standard bolt spacing distances and which can be used to measure around the protruding flanges on steel members with channel shapes, I shapes or other cross-sectional variations.
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