| 摘要 |
<p>The adjustable template comprises a number of bars coupled together, the bars being slidable in relation to each other. Each bar has a lengthwise profiled rib along one side, and a mating recess, with undercut portions, along the other, both being of circular cross-section. Alternatively, the bars may be rectangular or of dovetail section, or the bar can be of cruciform section, with a square tube open a long one edge, while along the opposite one there are two ribs inclined to each other. There may be pins protruding from the ends of the bars, typically forming extensions of the ribs.</p> |
