Estonian industralist Ivan Ivanovich Steglau designed and built at St Petersburg 3 excellent biplanes (No. 1, 4 May 1911), notable for welded steel structure and cantilever wings.
Estonian industralist Ivan Ivanovich Steglau designed and built at St Petersburg 3 excellent biplanes (No. 1, 4 May 1911), notable for welded steel structure and cantilever wings.