471 Interval Timer
The Model 471 Interval Timer contained two built-in time base generators to provide control of "ON" and "OFF" intervals of a Model 829 Electronic Switch and/or a Model 876B Pulse Generator. The timing cycle could be synchronized to a signal. The Frequency Response was 20 to 20,000 Hz; the duration of "ON" and "OFF" periods was continuously variable over a wide range to 10 seconds maximum; the input could be be triggered externally from contacts and negative pulses. The timer sold for $800 in 1960.
