collar ties the cross-beams that hold roof trusses together
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![William [Bill] Gray](https://cfcdn.proz.com/profile_resources/25/130405_r43c0e14f4c70f.jpg "William [Bill] Gray")
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| Creator: | |
| Language pair: | English |
| URL: | http://www.thereader.co.uk/magazine/20/routledge.php |