sentences:  The Burger King Specialty Sandwiches are a line of sandwiches developed by the international fast-food restaurant chain Burger King in 1978 and introduced in 1979 as part of a new product line designed to expand Burger King's menu with more sophisticated, adult oriented fare beyond hamburgers.Additionally, the new line was intended to differentiate the company from other fast food hamburger restaurants at the time.Since the line's introduction, the other sandwiches have been discontinued, leaving the chicken offering, the Original Chicken Sandwich (abbreviated as OCS), as the primary product left.