Dr. Bhanu Pratap Singh (born on January 7, 1961) and Aaditya Pratap Singh (born on January 12, 1988) of Chhattisgarh, India, created an envelope measuring 22.454m (73ft and 8in) in length and 10.998m (36ft and 1in) in width, on March 2, 2013, at City 36 Mall, Raipur.