Sentry reference thingy

I found this thick little reference spiral bound booklet among some paperbacks:

From the olden days of the 20th century:

But paper clipped in the back were these pages:

I have no idea why I clipped them out of the binding and then paper clipped them back in :)  (also, don't remember much about the Sentry even after spending 15 years fooling with them - BTW, the Integrator was an HP1000 mini-computer networked to the Sentry testers).

Best Regards,
Chuck, WB9KZY
http://wb9kzy.com/ham.htm