Reed Clock M410

This document contains the engineering schematic for the M410 Reed Clock, produced by Digital Equipment Corporation in 1968. It provides a detailed circuit diagram, including a parts list that specifies resonant reed relays, integrated circuits (DEC7400N, DEC7474N, DEC7440N), transistors, capacitors, and resistors. It also includes a transistor and diode conversion chart and usage notes regarding frequency variants for the resonant reed relay (KI).