German inventor and mechanical engineer (1858-1913) famous for the invention of the diesel engine. Unsigned handwritten note in German by Rudolf Diesel on one of his personal calling cards, 4 x 2.5, elegantly engraved with his name in a simple, cursive script: "Dr. in.h.c. Rudolf Diesel," along with his address in Munich. Diesel writes, in full (translated): "Dear honored Privy Councillor, My wife sends her heartfelt thanks for the magnificent flowers. We were pleased to make your acquaintance and regret not being able to say farewell, but we hope for another meeting. I will be happy to advise your son." In fine condition.
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