On August 13, 1846, early in the conflict, U.S. naval forces under Commodore Robert F. Stockton arrived at Los Angeles and raised the American flag without opposition. On 13th August , 1889 William Gray of Hartford, Connecticut, received a patent for a coin-operated telephone. Soon he formed the Gray Telephone Pay Station Company to market his invention. Tripura was under princely rule for a long time. On August 13, 1947, Tripura's queen, Maharani Kanchanprava Devi also signed a consent paper for the Merger Agreement to join the Indian Union. On August 13, 1961, the Communist government of the German Democratic Republic began to build a barbed wire and concrete Antifascistischer Schutzwall between East and West Berlin.