Once upon a time I came across a document from National Semiconductor that 
talked about their transistor product line.  At the time they made less than 
100 different transistor dies... but sold them under 10,000+ different part 
numbers.    Some were just packaging variations.   Maybe some selection tests 
were done to decide what part number to sell them under,  maybe they didn't.  
Checking some pricing,  the same die (in the same package) could sell for 
pennies or big bucks.

                                          
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