Web Drawing Image 'tt-st-narrow-yard-throat'
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DWF, or "Drawing Web Format", is specially designed to display precision drawings over the internet. Unlike PDF, which is just a (bloated) picture of a piece of paper, DWF has CAD intelligence allowing you to make measurements, zoom and pan to specific areas, and more. To view this image, you'll need the free Autodesk DWF viewer, (which should download automatically, if you don't already have it.)