number builder entered service withdrawn notes
number
builder
entered service
withdrawn
notes
number
number parsed year month day
number parsed year month day
number text date date text
439 nzr addington 9-1-1909 2-3-1957 converted to 4-cylinder simple, 6-1949
what is the total number of different builders in the table ?
WP VBD-AUX DT JJ NN IN JJ NNS IN DT NN .
1
select count ( distinct c2 ) from w