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* Finishing letters and group size up to 1977. | * Finishing letters and group size up to 1977. | ||
* The 5-digit shape numbers were added in | * The 5-digit shape numbers were added in mid-late 1977 and ended in 1984 (when 5 digits occur, the meaning of the 4 first remains the same - see [[#Notes|notes 9]]). | ||
* Double suffix numbers are underscored and continue consecutively from '80 up to '99, | * Double suffix numbers are underscored and continue consecutively from '80 up to '99, |