Ohio Revised Code Section 2923.121(A) prohibits the possession of firearms in any room in which liquor is being dispensed under a D class permit. A license to carry a concealed handgun under Ohio Revised Code Section 2923.125 (CHL) or 2923.1213 (TEL) does not allow you to carry a concealed handgun in a D class permit premises, as this is one of the areas forbidden by 2923.126(B)(4) (which merely recites back to 2923.121). 2923.121(C), which used to include an affirmative defense for handguns, no longer does so. The current affirmative defense is for firearms other than a handgun. It therefore appears that there is NO WAY to legally carry a handgun in a Class D bar or restaurant, open or concealed. The carrying of non-handgun firearms would be controlled by 2923.121(C), meaning you would have to prove an affirmative defense.