GC6NMDF ▼
Size:  (small)
I believe this to a ventilation shaft for the Centrtal #6 Mine (see near shaft). Single shafts often needed ventilation or the air could become stale. I believe there was a fan in the building which forced air into the mine.
Additional Hints (Decrypt)
Decryption Key
A|B|C|D|E|F|G|H|I|J|K|L|M ------------------------- N|O|P|Q|R|S|T|U|V|W|X|Y|Z
(letter above equals below, and vice versa)
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