CREATE TABLE table_52927 ("Class" CLOB, "Wheels" CLOB, "Date" CLOB, "No. built" FLOAT, "Loco Nos." CLOB)

On what date were less than 10 built with a locomotive number of 31-35?
SELECT "Date" FROM table_52927 WHERE "No. built" < '10' AND "Loco Nos." = '31-35'
SELECT "Date" FROM "table_52927" WHERE "Loco Nos." = '31-35' AND "No. built" < '10'