Table: snaefell_fatalities
Columns: rider
date
place
race
event
machine

Question: Harry l Stephen rides a Norton machine on what date?
SQL: SELECT "date" FROM snaefell_fatalities WHERE "machine" = 'norton' AND "rider" = 'harry l stephen'

Question: What machine did Keith T. Gawler ride?
SQL: SELECT "machine" FROM snaefell_fatalities WHERE "rider" = 'keith t. gawler'

Question: Where was the 249cc Yamaha?
SQL: SELECT "place" FROM snaefell_fatalities WHERE "machine" = '249cc yamaha'

Question: What machine did Kenneth E. Herbert ride?
SQL: SELECT "machine" FROM snaefell_fatalities WHERE "rider" = 'kenneth e. herbert'

Question: What event was Rob Vine riding?
SQL: SELECT "event" FROM snaefell_fatalities WHERE "rider" = 'rob vine'