My JHT book has arrived! Initial impressions:
The English text is a bit opaque, and I wonder if a machine translator was used for the bulk of the translation. For example:
When explanation for overhauling a camera is to be given for respective models, the volumes of books will become enormous and impracticable.
Which I would interpret as "This is not a step-by-step guide for servicing specific models of cameras, that would require a crazy-big book. But you should be able to figure stuff out from the included examples of similar cameras which are illustrated in the second half of the book"
The author recommends benzine (C6H6) for some jobs, but that hasn't been readily available in the USA for many years. I think naptha (cigarette lighter fuel) may be a safer alternative.
Who is the intended audience? Beginners / hobbyists who may have been given an older camera.
What sorts of cameras are discussed: Popular mechanical models of the 1960s and 70s which may be still available cheaply, including "trapped-needle" automatic exposure types, which were once super common.
What's not covered: Higher-end cameras including Leica, as well as electronic types such as Canon's AE1. But author does cover Nikon S and F and FM! I regard Nikon F as a happy coincidence of a high-quality product which can still be had at bargain prices today, and which is relatively easy to service. Hence, it's inclusion in the book makes sense.