Table: f1_1961_teams
Columns: entrant
constructor
chassis
engine
tyre
driver
rounds

Question: What company was the entrant for the race with Jack Fairman as the driver with a chassis of t45?
SQL: SELECT "entrant" FROM f1_1961_teams WHERE "driver" = 'jack fairman' AND "chassis" = 't45'

Question: What chassis was used by roy salvadori?
SQL: SELECT "chassis" FROM f1_1961_teams WHERE "driver" = 'roy salvadori'