<https://www.helicoptersmagazine.com/sandel-introduces-led-upgrade-for-3-ati-ehsi-624/#webpage>
<http://schema.org/description>
"Jan. 7, 2008, Vista, CA - Sandel Avionics has announced that it has begun shipping an updated version of its popular 3-ATI SN3500 EHSI (electronic horizontal situation indicator) that features an LED (light-emitting diode) backlighting system."
<https://www.helicoptersmagazine.com/sandel-introduces-led-upgrade-for-3-ati-ehsi-624/>