A miner’s tattoos are just a piece of clothing, a way to express his or her personality, but sometimes they are also a way for a miner to communicate his or hers.

The most famous tattoo artist in the country is Tony Stark, the Iron Man character.

But others, like a former mining employee and the head of the Pennsylvania Coal Mines, have been known to tattoo their jobs.

Here’s a look at some of the more famous tattoo artists.