Some National Panasonic service manuals from 70's

Finally I have managed to scan and convert to JPEG - from an old microfilm - some service manuals of National Panasonic electronic equipments from 70's.

These are:

• Motional Feedback Speaker-Amplifier System mod. MF-800 (but then I found a much better PDF version on the web)
• Flash Unit PE-2410
• R-155 portable radio receiver (almost unreadable on the microfilm)
• R-510B portable radio receiver with cassette tape recorder
• R-531B (which is the one I was directly interested in, for a future restoration work).

You can find all material above stored at link here below:
Some National Panasonic service manuals from 70's

My National Panasonic R-531B, to be restored soon