Just to argue semantics (and parrot things I've gathered from the intertubez). Fender never sued anyone.
Norlin (Gibson's Parent Company) Went after Ibanez in 1977 and it was only trademark infringement on the open book headstock that Ibanez (or more accurately Hoshino Gakki Gen) was copying. I'm fairly certain the case was settled out of court. This was the main focus and I don't think any other suits were filed until Gibson went after PRS.
I'm not saying you are wrong to say it's "Lawsuit Era" as it is pretty much the common nomenclature when referring to these MIJ instruments. I think that "Copy Era" is a bit more accurate.
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This is exactly correct. The whole 'Lawsuit' was between Gibson and Hoshino Gakki. Hoshino Gakki's main brand is Ibanez, and Hoshino Gakki, (unlike Tokai to stretch being on topic here) did not have their own factory. No other firms or companies were involved. The 'open book' headstock shape (and not the 'squashed frog' inlay as is also often pointed out) was the point of the lawsuit.
Just for clarity, this is an 'open book' headstock with a squashed frog
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