Looks like a kludge.  Seems like a more conventional use of that stuff
would have the jack boxes and the relay base mounted on the table.  So
maybe it was used without a table.  Anyway you did a beautiful job of
restoring.

         ---

         "Ya can argue all ya wanna, but it's dif'rent than it was."
         "No it ain't! No it ain't!  But ya gotta know the territory."
                 Meredith Willson, The Music Man