Simcha Blass Simcha Blass Simcha Blass (November 27, 1897 – July 18, 1982; ) was a Polish-Israeli engineer and inventor who developed the drip irrigation system with his son Yeshayahu. Simcha Blass was born in Warsaw, Poland, which was then part of the Russian Empire, to an Orthodox Jewish family. He was active in the Jewish self-defense units organized in Warsaw to defend Jews during the end of World War I. His engineering studies in Warsaw were interrupted by the Polish-Soviet War and completed after that war. During the war, he was recruited to the Polish Army, there he invented for the
Simcha Zorin battle with a retreating German unit; seven of his men were killed. In 1971, some 25 years after the war, Simcha Zorin emigrated to Israel. Simcha Zorin Shalom (Simcha) Zorin (1902–1974) was a Jewish Soviet partisan commander in Minsk. Many Jewish partisans in Belorussia had their own units that operated as part of the general Soviet partisan movement and the overall Jewish resistance movement fighting the Nazis in occupied Europe, although some of these Jewish units lost their Jewish character over time. The Zorin unit, led by Simcha-Shalom Zorin, included 800 Jews. The Germans invaded Minsk in late June 1941