DIATONE: What happened?

We are told ...

A subdivision of Mitshubishi that manufactured loudspeaker drivers in addition to home and studio loudspeaker systems, started in 1941 to manufacture monitors for N.H.K. (Japanese Broadcasting Corporation) but closed down in 1999 and apparently stopped making drivers even earlier than that, the full range drivers derived from the original NHK designs are absolutely revered by the Japanese audio elite.

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