Question: Name the build date for total produced of 146
SQL: SELECT "Build date" FROM "2-1257252-1" WHERE "Total produced" = 146.0;

Question: Name the model for specification of DL-066
SQL: SELECT "Model" FROM "2-1257252-1" WHERE "Specification" = 'DL-066';

Question: Name the power output for model of S-13
SQL: SELECT "Power output" FROM "2-1257252-1" WHERE "Model" = 'S-13';