CREATE TABLE table_203_168 (id DECIMAL, "team name" TEXT, "leagues" TEXT, "base" TEXT, "year started" TEXT, "year ended" TEXT, "notable riders" TEXT)

what team started in 1949 and ended in 1973 ?
SELECT "team name" FROM table_203_168 WHERE "year started" = 1949 AND "year ended" = 1973
SELECT "team name" FROM "table_203_168" WHERE "year ended" = 1973 AND "year started" = 1949