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Stephen wrote:
> On Tue, 15 Jul 2008 07:36:10 -0500, Mike Raiford <mra### [at] hotmail com> wrote:
>
>> (PID - Andrew should know what this means, Proportional,
>> Integral, Derivative )
>
> Thank you I read it as "Piping & Instrumentation Diagram"
...and I read it as Prolapsed Intervertebral Disc
John
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