Are they Chazon Ish or Kivelevitch?
My mistake. I assumed kivelevitch was a zan Chazon ish but I see it is a subset of Braverman.
"These Esrogim were attested to by Rabbi Yehoshua Leib Diskin, the Brisker Rav, who upon seeing a certain Esrog tree remarked "This is my tree". From this tree the Braverman family established their stock in Petach Tikva. A sub-strain of Braverman is the KIVILEVITZ variety."