CREATE TABLE table_203_665 (id NUMBER, "name" CLOB, "municipality" CLOB, "established" NUMBER, "tower height\ in meters  ( ft ) " CLOB, "focal plane\ in meters  ( ft ) " CLOB, "current status" CLOB, "current condition" CLOB)

were any towers established before the year 1800 ?
SELECT (SELECT COUNT(*) FROM table_203_665 WHERE "established" < 1800) > 0
SELECT (SELECT COUNT(*) FROM "table_203_665" WHERE "established" < 1800) > 0