Stretching the point a bit, the Post Office belongs in the same category as Bell. It’s a government regulated monopoly, selling services for a profit but firmly required to serve public purposes. So it does.
The public purpose works at the supplier end as well as the customer end. The PO buys its trucks from American companies manufacturing in America. In the last 50 years they used Jeep Dispatchers made in Toledo, then Grumman LLVs made in Lycoming. Their new vehicle, starting to appear on the streets after several years of development, is the Oshkosh NGV, made in South Carolina.
Their stamps are stored and distributed in the vast Kansas City caves, and printed by various American companies. Small publishers trying to survive in a world owned by Bezos have turned toward foreign printers, mainly in Korea.
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Pointless personal sidenote: When I lived in KC in the 80s I drove through the cave city a couple times. It’s impressive. A regular city street goes through the cave, lined with storefronts on both sides like a giant industrial mall. The ceiling is rough stone, so you know you’re in a cave, not just a tunnel.
Polistra's Mill 