Day 10: Ever wonder how they make these things? I found a video....scroll down.
Made in USA, by D&L Foundry, found in NYC.
Not all covers have marking from where it's made.
Here's one from Bridgewater, NJ. Made by Campbell Foundry Company in Harrison, NJ.
Science Channel's "How It's Made": Manhole Covers
Tomorrow: more about how they are made outside the US.