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 - New Hitches For Your Old Tractor - by Chris Pratt. For this article, we are going to make the irrational and unlikely assumption that you purchased an older tractor that is in tip top shape and needs no immediate repairs other than an oil change and a good bath. To the newcomer planning to restore the machine, this means you have everything you need for the moment (something to sit in the shop and just look at for awhile while you read the books). To the newcomer that wants to get out and use the machine for field work, you may have already hit a major roadblock. That is the dreaded "proprietary hitch". With the exception of the
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