Which preposition to use with subsidiary

of Occurrences 43%

A worker, formerly employed by a subsidiary of the Eastern Lumber & Railway Company, had been deprived of his wages on a technicality of the law by the corporation attorneys.

to Occurrences 18%

Even the energy which is seemingly applied to destructive tasks is really subsidiary to a constructive ideal.

in Occurrences 1%

The attention of the pupil should be confined as much as possible to the most classical writers; and the French would furnish a most useful subsidiary in a course of history.

Which preposition to use with  subsidiary