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Re: Signing mylars or vellums

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> On 2/11/98 - Lynn Howard wrote:
> 
>  > Do we as professionals have to sign and stamp drawings that are on
> vellums or mylars?  We sign blueprints all the time, as these are
> not easy to alter or add to.  However, vellums and mylars can be
> altered and to  my knowledge that would be difficult to detect..We do structural engineering for school projects where all the 
consultants and the architect must stamp the originals.  I keep a record 
set of what I have stamped.  

I can't see the difference between altering someones drawing "underneath" 
their stamp, or counterfeiting the stamp and signiture.

David Carpenter