CREATE TABLE table_10412 ("Class" CLOB, "Type" CLOB, "Quantity" FLOAT, "Date" CLOB, "LNER Class" CLOB, "1946 LNER nos." CLOB)

Which class has less in quantity than 174 between the years 1921 23?
SELECT "Class" FROM table_10412 WHERE "Quantity" < '174' AND "Date" = '1921–23'
SELECT "Class" FROM "table_10412" WHERE "Date" = '1921–23' AND "Quantity" < '174'