Dennis, The T50 manual copy got here FB, thanks! Will try to get the owner to loan it for MRCG 2004 in May. Subject: Re: [Milsurplus] LM calibration book > Weren't these made up individually for each unit? > > Dennis D. W7QHO > Glendale, CA I think there was a thread a while back about the mechanical/analog device used to generate the books for each set. EdZ