Posted 03/02/2014 4:39 pm
If you watch "October Sky" or any other movie about underground mining you will see a big board with tokens like that, numbered with a hole in them as the worked go down they take their tag and keep it with them in the mine, so in the event of a collapse they know who is missing.
No clue if this is even close but seems the most likely explanation.
No clue if this is even close but seems the most likely explanation.
