What bore goes with an 18 AB?
CREATE TABLE "salmson_post_world_war_one_engines" (
  "name" text,
  "cyl" text,
  "bore" text,
  "capacity" text,
  "power" text,
  "weight" text
);
SELECT "bore" FROM "salmson_post_world_war_one_engines" WHERE "name"='18 ab';