Dates
Years on older releases (taken from the letters in "NIHON RECORD KYOUKAI" [1]):
- N = 1984
- I = 1985
- H = 1986
- O = 1987
- R = 1988
- E = 1989
- C = 1990
- D = 1991
Catalogue numbers
First two letters for the company - list
Third letter for the formats - list