[Milsurplus] I-222 on Ebay ?

[Hubert Miller]

This is a very attractive and modern looking instrument for its 1943 date; also i note a couple BC-348 knobs.
This now on Epay.
http://www.ebay.com/itm/US-Army-Signal-Corps-I-222-A-RF-Signal-Generator-for-Ham-Radio-VINTAGE-CLEAN-/201854599220?hash=item2eff78c034
What equipment was this to service?
-Hue
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