CREATE TABLE table_69989 ("Lot No." FLOAT, "Diagram" FLOAT, "Built" TEXT, "Builder" TEXT, "Fleet numbers" TEXT)

What diagram built in 1962 has a lot number smaller than 30702?
SELECT MIN("Diagram") FROM table_69989 WHERE "Built" = '1962' AND "Lot No." < '30702'
SELECT MIN("Diagram") FROM "table_69989" WHERE "Built" = '1962' AND "Lot No." < '30702'