in how many territories were the wars fought where 37 mm automatic air defense gun m1939 were used ?
SELECT DISTINCT COUNT attr_open var_uri attr_close where brack_open dbr_37_mm_automatic_air_defense_gun_M1939_ attr_open 61-K attr_close dbo_usedInWar var_x sep_dot var_x dbo_territory var_uri sep_dot var_x a dbo_MilitaryConflict brack_close