Museum of Obsolete Media on Nostr: I've been asked if I can identify these audio cassettes that are in a university ...

I've been asked if I can identify these audio cassettes that are in a university archive and I'm stumped.

They have two playback cutouts, and in one of the spools I can see 'Japan'. It would appear to be 30 minutes of tape.

Anyone got any ideas what machine they might have been used in?