Thanks,  but I figured it out. A 1751 is apparently the mainframe (in
the original sense) for the 1750 telephone system.

It has all the good looks of a string of 3380s - a wall of blue.

--
Will

On Tue, Nov 25, 2014 at 8:41 PM, Mike Schwab <[email protected]> wrote:
> http://www.beagle-ears.com/lars/engineer/comphist/ibmmodel.txt
>
>  1715 -IBM Digital Display Unit
>
>
>
> On Tue, Nov 25, 2014 at 5:46 PM, William Donzelli <[email protected]> wrote:
>> Perhaps this might ring a bell in someones head.
>>
>> Does anyone know what an IBM 1751 Control and Switching Unit is, and
>> what is was used for?
>>
>> --
>> Will
>>
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>
>
> --
> Mike A Schwab, Springfield IL USA
> Where do Forest Rangers go to get away from it all?
>
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