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→Product Serial Numbers
= Product Serial Numbers =
= Product Serial Numbers =
Serial numbers are composed of at least [[#Prefix|three letters]] followed by ten decimal digits. The tenth digit is a [[#Check_Digit|check digit]], meaning that it is derived from the other digits.
Serial numbers are composed of at least [[#Prefix|three letters]] followed by eleven decimal digits. The eleventh digit is a [[#Check_Digit|check digit]], meaning that it is derived from the other digits.
== Prefix ==
== Prefix ==