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Washington, D.C., circa 1921. "Auto School." Where they're having a pop quiz on axles. National Photo Company Collection glass negative. View full size.
Differential calculus.
[Keyboard spit-take, thanks. -tterrace]
The Rumpler C.IV was a German single-engine, two-seat reconnaissance biplane. The C.IV was a development of C.III with different tail surfaces and using a Mercedes D.IVa engine in place of C.III's Benz Bz.IV. - Wikipedia
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