French physicist (1892-1987) known for his theory that matter has the properties of both particles and waves, who was awarded the 1929 Nobel Prize in Physics. Vintage fountain pen signature, "A Monsieur Georges Somville, en homage cordial, 22 juin 1962, Louis de Broglie,” on an off-white 3.75 x 2.75 card. In fine condition. Accompanied by the original mailing envelope.
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