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Koenig's Philosophical Apparatus-France Rudolph Koenig's exhibit 1 silver albumen print; 21 x 26 cm. Mounted on backing board. Title on label: Koenig's philosophical apparatus -- France. Exhibit title: Koenig, Rudolph, Paris, Exhibit #148, Main Exhibition Building, Bldg. #1. Acoustical apparatus and collection of tuning forks.