There are Pt100 Ω standards of IPTS-68, ITS-90, and JPt100 Ω, but what is the difference between them?

IPTS-68: This is an international standard from 1968 where R100/R0=1.3850 that was used by the JIS from 1989 to 1997, but currently it is not in use.
ITS90: An international standard from 1990 where R100/R0=1.3851, and used by the JIS from 1997 to the present.
JPt100: A standard unique to Japan where R100/R0=1.3916, but was discarded in 1989.

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