[Test-Equipment] Superior instrument Model 76 C.R. Bridge and signal Tracer

[DW Holtman]

Hello,

Last weekend at a very small hamfest (about 15 people) in Idaho I traveled to, I
picked up a Superior Instruments Co. Model 76 C.R. bridge and Signal Tracer. 
Does anyone know anything about this unit? Where I might get schematics? I have
tried the web, bama and Nostalgia Air. 

Thank you in advance.

73's
DW Holtman
WB7SSN