Scientific American. 249 April 4, 1908. … the ear and which, the Instant Insulator, L. W. Storror 882,803 It Is applied magnifies the ' REFUSE ALL SUBSTITUTES^a Insulator strain, W. C. Terry 882,979 sound waves in such manner Jelly testing method and apparatus, J. Alex- as to Cause an astonishing in- ander 882,731 crease In the clearness…
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