I may need two of these odd ducks and they appear to be long obsolete devices. Anyone know a source or if there is a sub?

Do you know what they are? I don't but a websearch says nothing. So is it exotic, or a common part with a different number?

It is a discontinued Hitachi chip. Only reference I can find is that it shows as discontinued in an old Hitachi manual. Part looks like a buffer or line driver of some sort... but the good news is I found the problem was one of the more common LS logic chips had failed.

I never could find a cross reference!