1
William D Johnson, Donald L Ewing, James S Grisham Jr: Distributed single board computer industrial control system. Forney Engineering Company, Marvin A Naigur, John E Wilson, John J Herguth Jr, February 24, 1981: US04253148 (45 worldwide citation)

An industrial control system in accordance with the present invention is provided with a plurality of diverse controlled devices (e.g., fans, pumps, valves, solenoids, relays, etc.) for effecting overall system control. Each device has a unique set of logic control functions and/or command sequences ...


2
Donald L Ewing: Infrared flame detector adaptable for different fuels. Forney International, Lane and Aitken, November 7, 1989: US04878831 (8 worldwide citation)

In an infrared flame detector system an infrared photodetector is positioned to receive infrared radiation from the flame to be detected. The output of the infrared flame detector is amplified with a gain readily switchable between two different gain values. The amplified output signal is filtered b ...