Yakov Mandelblyum was born in Wolczyn, Poland, 1911 to Yudel and Ester. He was married to Malka nee Grinberg. Prior to WWII he lived in Wolczyn, Poland. During the war he was in Wysokie, Poland. Yakov was murdered in the Shoah. Place of death: Wysokie, Poland, 11/10/1942.
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