Table:
0
A
B
C
D
E
1
'Name' or designation
Wheel arrangement
Builder
Year built
Year withdrawn
2
Theakston Fordson
Bo'2'
Theakston
1928
c1935
3
Super-Scooter ( JAP Scooter)
Ultra-light 4-wheel scooter
RH&DR
c1929
c1945
4
War Department Locomotive
4-wheel scooter
War Department
1929
1949
5
Rolls Royce Locomotive
Bo'2'
RH&DR
c1932
1961
6
Firefly
0-6-0
HCS Bullock (re–built RH&DR)
1936 (re–built 1945)
1947
7
Motor Cycle Scooter
Ultra-light 4-wheel scooter
RH&DR
c1949
c1952
8
'Royal Anchor'
B-B
Charles Lane of Liphook
1956
1956

Questions and formulas:
Question: what was the builder in 1929
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,D1=1929),3))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E8,D2:D8=1929),3))
Level: medium