Has anyone purchased filters or protectors from Electronic Specialists of Natick, MA, and do you know how to reach them now? I tried to contact them about buying another, but their phones are disconnected, and their e-mail bounces, although their website is still up and running. If they have gone out of business, any recommendations for a 3-lead RS-232 protector with screw terminals? We're looking to protect the printer output of the electric gate keypad at the transmitter site. This is a long cable, and prone to damage from nearby lightning strikes. Many thanks,