Beautifully engraved certificate from the Autoforce Ventilating System issued in 1908. This historic document has an ornate border around it with a unique overprint of "foul air" with a vent going above ground. This item is hand signed by the Company's President ( J. H. Myrick ) and Secretary ( James H. Sleeper ) and is over 98 years old.
Autoforce Ventilating System - South Dakota 1908
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