Table:
0
A
B
C
D
E
F
1
Number Range
Builder
Introduced
No. Built
Region
Withdrawn
2
79958-59
Bristol / Eastern Coach Works
1958
2
Scotland
1966
3
79960-64
WMD Donauwörth
1958
5
Eastern Region/London Midland
1967
4
79965-69
D Wickham & Co
1958
5
Scotland
1966
5
79970-74
Park Royal Vehicles
1958
5
London Midland / Scotland
1968
6
79975-79
AC Cars
1958
5
Scotland / Western Region
1968
7
999507 Elliot
Wickham
1958
1
Departmental
1997
8
998900-998901
Drewry
1950
2
Departmental
1990

Questions and formulas:
Question: when was the building withdrawn when the builder was ac cars and was introduced before 1958?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,(B1="ac cars")*(C1<1958)),6))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F8,(B2:B8="ac cars")*(C2:C8<1958)),6))
Level: medium