I have a home in Oregon built 1920 that has a very unusual fireplace with a brass plate imbedded in the firebox that says "Perrine Vacumm Fireplace Co." St. Johns, Oregon Pat'd 1912. This fireplace has a very small firebox and draws back like a big tongue into the flue. Unfortunately when we bought the house 19 yrs ago, we screwed it up by having a mason come in and install a damper where there was none before. This changed the architecture of this patented design and the fireplace smoked ever since. We have gotten by with building up the height of the box but what I want to do is restore it. I want to get the damper out of there but will need a drawing or a picture so that the fireplace can be restored to its original design. Can anyone be of assistance. Thank you.