<Tr> <Td> </Td> <Td> February </Td> <Td> </Td> <Td> May </Td> <Td> </Td> <Td> August </Td> <Td> </Td> <Td> November </Td> </Tr> <Tr> <Td> </Td> <Td> March </Td> <Td> </Td> <Td> June </Td> <Td> </Td> <Td> September </Td> <Td> </Td> <Td> December </Td> </Tr> <P> The letter "I" is omitted because it might be mistaken for the numeral "1" or the letter "J". The letter "O" is omitted because it might be mistaken for the numeral "0". </P> <P> Following the date code is the third section: the Interfix Number (NN), which can be 2 or more digits long . This indicates the batch of material the item belongs to . </P>

Alpha-numeric designator systematically assigned at the time of manufacture