Question: Harry L Stephen rides a Norton machine on what date?
SQL: SELECT "Date" FROM "2-12779528-1" WHERE "Machine" = 'Norton' AND "Rider" = 'Harry L Stephen';

Question: What machine did Keith T. Gawler ride?
SQL: SELECT "Machine" FROM "2-12779528-1" WHERE "Rider" = 'Keith T. Gawler';

Question: Where was the 249cc Yamaha?
SQL: SELECT "Place" FROM "2-12779528-1" WHERE "Machine" = '249cc Yamaha';

Question: What machine did Kenneth E. Herbert ride?
SQL: SELECT "Machine" FROM "2-12779528-1" WHERE "Rider" = 'Kenneth E. Herbert';

Question: What event was Rob Vine riding?
SQL: SELECT "Event" FROM "2-12779528-1" WHERE "Rider" = 'Rob Vine';