user: Question: What is the sum of Solidat (c) that's purpose is display type, heavy duty jobs, and a hardness (brinell) is smaller than 33?
Columns: ['Sn/Sb (%)', 'Liquidat (°C)', 'Solidat (°C)', 'Hardness ( Brinell )', 'Purpose']
Types: ['text', 'real', 'real', 'real', 'text']
Sample row: ['6/15', 261.0, 240.0, 23.0, 'Routine']
SQL:

assistant: SELECT SUM("Solidat (°C)") FROM "Table" WHERE "Purpose" = 'display type, heavy duty jobs' AND "Hardness ( Brinell )" < 33.0;