Pancreas
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- #21
Yes. Zero Surge was the original. My understanding is that the patents expired and that is how Furman and Audioquest went with Series Mode protection.
This is the patent that I believe is the key one
US4870534A - Power line surge suppressor - Google Patents
A surge suppressor for repeatedly protecting a load against surges occurring on A-C power mains from lightning surges or the like comprises a first series circuit having a first inductance and a first alternating voltage limiter, including at least a first capacitance and a bidirectionally...patents.google.com
So which furman do you recommend that have this?