What was the type of boat built in Port Blakeley
CREATE TABLE "table_4_early_o_s_n_monopoly_boats" (
  "name" text,
  "type" text,
  "year_built" real,
  "where_built" text,
  "initial_owners" text
);
SELECT "type" FROM "table_4_early_o_s_n_monopoly_boats" WHERE "where_built"='port blakeley';