Name the builder numbers with RR class of a1 and year less than 1916
CREATE TABLE "numbering" (
  "year" real,
  "rr_class" text,
  "rr_nos" text,
  "builder" text,
  "builder_nos" text,
  "gwr_br_nos" text
);
SELECT "builder_nos" FROM "numbering" WHERE "rr_class"='a1' AND "year"<1916;