I was wondering if as a collective community of enthusiasts we might be able to turn up what appears the only two oustanding/unavailable manuals for the Datron Wavetek metrology equipment While the 4920M is close to the AVMS there were two service manuals assigned and printed. 4920 Maintenance Handbook 850265 4920 Reference Handbook 850266 It would be great if we could add these to the collective community knowledge base. I am more than willing to pay shipping costs for a hard copy, digitize and return said manuals. Copies would be shared on Ko44b and BAMA and thus spread from there. As an aside the 4950 never had any service docs and Norwich refuses to release any engineering docs. Sigh, yet they called it old and obsolete.....