1863, the first U.S. patent for an antifouling paint for ships' hulls was issued to J.G. Tarr and A.H. Wonson (No. 40515) for a copper oxide, tar and naptha mixture.
1863, the first U.S. yeast preparation patent was issued to J.T. Alden of Cincinnati, Ohio (No. 40,451), for "an improvement in the preparation of yeast" which reduced concentrated yeast from a plastic or semi-fluid state to a dry granular form, a convenient way of preservation for future use.
1892, the first automatic telephone exchange, using the switching device invented by Almon B. Strowger, opened to the public in LaPorte, Indiana.
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