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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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