From their website.
Located at 2115 Northeast Expressway (I believe might be on Route 66).
Opened in 1921 and the original of the eventual eight Beverly's Pancake Corners in Oklahoma City.
Their website says they still serve the original Chicken in the Rough.
Next time through OKC on 66, I'll have to check this place out.
Got That Hankering for Some Chicken, Rough-Style. --RoadDog