One of the sign accompanying the IU. It reads.
NASA engineers at Marshall Space Flight Center designed the instrument unit for
the Saturn V. Overall responsibility of the Instrument Unit was assigned to
IBM's Federal Systems Division. This is a photograph of the IBM team
responsible for S-IU-513.
The IU was not designed for the Saturn V, per se. The same instrument unit,
with only minor component differences, was also used on the Saturn IB, and in
fact the IU was launched on three unmanned Saturn IB missions (SA-201, SA-203,
and SA-202) before the first
Saturn V launch.