Vintage Koehler Permissible Flame Safety Lamp 209

Vintage Koehler Permissible Flame Safety Lamp No 209 Used See photos for condition and measurements Miner Mining Miner’s light lantern Cast Aluminum Mining Safety Lamp Coal Mining Collectors Item Vintage Official Standard Safety Lamp Once Issued to Coal Miners Manufactured by Koehler MFG Co Marlboro Massachusetts MSHA approved piece Approval No 209-15 History lesson- the way it worked is they would set the flame height between the two lines on the glass. If the flame dropped below the bottom line, that meant there was a lack of oxygen present. If the flame grew above the top line that meant there was gas present. It was only safe to work in the mine if the flame was between the top and the bottom lines. $300 for both