[Boatanchors] Radios made by Signal Corp. ?

[w7fe]

Chuckle of the day from qth.com classifieds:

Need Repair Info - Signal Corp, WWII 
I have several pieces of antique radio equipment that I would like to restore. The items were made by Signal Corps. and I'm trying to find any place that may be able to provide me with repair info. 
Any help is greatly appreciated.
Thanks!
Greg
N9FME 

Listing #1172848 - Submitted on 12/29/14