Stephen wrote:
> On Tue, 15 Jul 2008 07:36:10 -0500, Mike Raiford <mra### [at] hotmailcom> 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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