Up for Sale is a D.F. & L. Ventilator w/ Patent Date May 22, 1877. Last 2 photos will show the Original Patent Patent Number and assignees for this particular Vent. Patent Number 191,033 issued to Charles E. Darling, H. Free & J.E. Lydston. Inventor's location is shown as Lewiston, ME which is just down the road from were this was found in Augusta. Back plate turns properly. Missing the original pull chain. 7 1/4" Diameter.
Please Look at All Pictures and Read Condition Section.