>> years is no exception. The contract often requires spares to be stocked 
>> or even delivered with the main item(s).
> 
> You don't have to go that far. 

If your customers does not believe you on your bright blue eyes that the 
components will still be available 20 years from now you definitely will 
have to. And space grade components (one of the fields I was referring 
to) are hard to get anyway.

-- 

Wouter van Ooijen

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Van Ooijen Technische Informatica: www.voti.nl
consultancy, development, PICmicro products
docent Hogeschool van Utrecht: www.voti.nl/hvu

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