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Rigan, a graduate of the Department of Engineering (1914) of Riga Polytechnic Institute (RPI) Mikhail Krivoshapkin, after studies worked as an engineer in Russia, where he built grain elevators. From 1920 until deportation to Siberia in 1941 he lived in Riga and was the author of several bridge projects in Latvia, worked as an engineer at Riga Construction Board and was a member of the Riga City Council (1925–1934). He worked in various public organizations. His descendants – grandchildren and great-grandchildren also pursue careers in engineering.

Life and Professional Activities of a Graduate of the Department of Engineering of Riga Polytechnic Institute Mikhail Krivoshapkin (1888–1943)