Series of shots inside Atla Vista Postal Terminal; Various shot of mail flow in culler facer canceller machine (1:10). Various shots of mail going through optical character reading system (4:45). CS of man ajusting machine's scan area (0:51). CUs of mail flow in optical character reading system (2:00). CUs of postal code being read off envelopes, they appear on screen of oscilloscope (1:31).