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Note: Zvi Hirsch Spiegel was erroneously listed as a son of R' Naftali Aryeh Spiegel, Ostrover-Kalushiner Rebbe in the 3rd edition of "The Unbroken Chain" by Neil Rosenstein. However, it has now been confirmed by one of the descendants of R' Naftali Aryeh Spiegel, Ostrover-Kalushiner Rebbe that Zvi Hirsch Spiegel was actually his brother.