1928 COPPER BANK VAULT VENTILATOR O. MC CO FAN 27H RARE OBSCURE GREAT LOOK. WELL THIS WILL GIVE PEOPLE A REAL CONVERSATION AT YOUR NEXT PARTY. I FOUND ALL KINDS OF INFORMATION ON THIS THROUGH ITS PATENT NUMBER. AT THE BOTTOM W THE FAN IS IT HAS A METAL TAG WITH THIS INFO: PAT. 17,…