Suppose a work was originally published in France (and in French) , in 1940. Suppose the author (Georges Macron) died in 1980. Suppose it was translated into English, and published in English in 1955. and the translator (Francis Farmer) died in 1995. Suppose the original French publisher went out of business in 1963, and there was no single successor company. Suppose the English-language publisher went out of business in 1975, and again there is no single successor company.
Suppose that John Reaper has written a new book in English. This new book reproduces many whole pages (say 70) of the 1955 translation, plus 15 full,-page illustration from that edition. John Reaper has approached the publishers of more recent editions of the translation (all of them from before 1990). John has approached the grand children of macron, and the heirs of Farmer (who had no children). He has looked through the records of the copyright offices in France, the UK, and the US, and has written to everyone named in those records as holding copyright in the book or its translation, or as being an agent of any such owner.
No one has admitted to holding the rights to the 1955 translation, or to knowing who does hold those rights.
Assume that the new book is an expansion and revision of the original book, not a commentary on or analysis of the original, and is not likely to qualify as a fair use of the original.
[Note that these details of publication dates and death dates are given to make it clear that the book is still under copyright in various countries, and to make it clear what sort of efforts John has gone to while trying tro secure permission.]
Can John Reaper lawfully publish his new book with a note:
Pages {numbers} are taken from the 1955 edition of {title} a translation of {french title} by Georges Macron. The holder of copyright in that work could not be found after diligent search. If anyone holds those rights or knows who does, please contact me at {address} and proper arrangements will be made.
If John does this, can he be successfully sued for copyright infringement of the 1955 translation or of the 1940 original?
John wants to publish in the US, the UK, and France and other EU countries.
This is based on comments to Can I print scans of a book's pages in my book? in this stack.