Luftwaffe triangle calculator model Plath DR2, 1939
so-called III. Reich, Dennert & Pape, Hamburg-Altona, aluminium, bakelite, turntable marked, with: "C. Plath device, no. : 127-107 A-1, FI. number: 23 825, D.R.G.M. 23825, System Kenemeyer", to Course calculation of an airplane depending on cross winds and the flight time, used age appropriate condition, D. 15 cm