| 摘要 |
A level having a pair of opposed edge rails, a web connecting the edge rails together, one of edge rails having an edge rail window therein with a cavity in the web communicating with the edge window. A vial assembly is mounted at said cavity in which the vial may be viewed from the edge rail window or from the sides of the web. Web openings may also be provided in the web with vial holding assemblies mounted in each web opening.
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