[SBE] Info needed on Inter Group Video Systems switcher

[Maynard, Frank J]

Does anybody have any documentation, manuals, schematics, etc., for the Inter Group Video Systems model 903 video switcher? This is a 10 input 2 M/E analog composite switcher apparently made sometime in the 70s or 80s by a company that seems to be no longer in business, gone without much of a trace.  Thanks in advance.

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Frank Maynard, NF8M, CPBE
Supervisor of Technical Operations, WWJTV & WKBD CW50 Detroit
CBS Television Stations Group 
26905 W. 11 Mile Rd., Southfield, Michigan 48033
Voice & Fax (248) ELgin 5-7129