Table:
text: Bob Gerard
Complete Formula One World Championship results
Complete Formula One World Championship results
Year_ Entrant Chassis Engine Points
1950 Bob Gerard ERA B-type ERA 0
1950 Bob Gerard ERA A-type ERA 0
1951 Bob Gerard ERA B-type ERA 0
1953 Bob Gerard Cooper T23 Bristol 0
1954 Bob Gerard Cooper T23 Bristol 0
1956 Bob Gerard Cooper T23 Bristol 0
1957 Bob Gerard Cooper T43 Bristol 0

Question: What year does Bob Gerard have an ERA engine and ERA-A chassis?

Question: What is the earliest year to have a Bristol engine under Bob Gerard?