Other contributors have said "Mr bing and mr hart?" is the same question as "Who is mr billingham?" If you believe that these are not asking the same thing and should be answered differently, click here
Mrs. Edit - if you're talking about addressing a letter to two men - it's 'Messieurs'. For example - Messieurs Smith and Jones. --Snakester1962 (Supervisor) Re-Edit-- Mssrs. is an acronym for...