hp 34740A front vertical PCB with 4½ digit 4-dot 7-segment hp LED readout:
hp 34740A main PCB:
corner of PCB with 3 MHz crystal oscillator, ceramic 6-decade data accumulater IC:
hp 6-decade counter IC, P/N 1820-0798 (date code 7810), gold pin Zebra CERDIP
