user: Question: Name the builder numbers with RR class of A1 and year less than 1916
Columns: ['Year', 'RR class', 'RR Nos.', 'Builder', 'Builder Nos.', 'GWR/BR Nos.']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1910.0, 'A', '10–14', 'Robert Stephenson & Co.', '3387–3391', '52–56']
SQL:

assistant: SELECT "Builder Nos." FROM "Table" WHERE "RR class" = 'A1' AND "Year" < 1916.0;