| http://www.w3.org/ns/prov#value | - The development of a method of making visible an internal organ or cavity, as is done with the special dye substance used in the case of the gall bladder or with lipiodol in outlining the bladder, the uterus, or the sinuses, leads the way to similar investigations in other viscera and tissues.The invention of new devices, such as the microscope, the stethoscope, or electrocardiograph, brings about
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