Clearly you can still get three-tab shingles! I did a shed roof with them just a few months ago. Even if nobody uses them for re-roofing jobs, they're still needed for repairs. But the market for three-tab has dwindled seriously over the past ten years to the point where they're seldom used for new roofs. Lack of demand has made them more expensive (economies of scale), so the market has shifted to the point where suppliers stock mainly architectural shingles.
I've never been in a shingle plant, but I assume that when manufacturers add new plant capacity or replace old machines, the new machines are for metric shingles and can't process three-tab.
As for the ridge shingles, these start out life as three-tabs, but are scored so you don't have to cut them by hand. Presumably they're processed by the same machines used to make standard three-tab shingles.
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Today's Featured Article - Box Plow Blues - by Tom Schwarz. One of the first implements most tractor owners obtain is the box plow. For very little money, this piece of equipment promises to plow and flatten any hill or vale on your ranch road or farm. At least that's what I thought! As simple as a box plow appears, it can be rather challenging to make work correctly. In our sandy soils of Florida, traction is king. You can never have wide enough tires or heavy enough weights to get all the traction you want … unless you own a monster tractor. U
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