I have 2 of these and Bobs thread had me take a look to see if I could help him. Unfortunately a different model. But figured I would ask if anyone had any details on these units. There is a label on the side that describes the pins and they do indeed work. It seems in the old days EG&G did a lot of development work. There are various patents and I think EG&G may have been considered fairly high quality. Space and military. Thanks for anything you may have or know. Regards Paul WB8TSL _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.