Centrifugal cream separator with a continuous flow

Inventor Carl Gustaf Patrik de Laval of Stockholm, Sweden, received an American patent for a centrifugal cream separator with a continuous flow on October 4, 1881.
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An International Commercial Telephone call made between Canada and the United States of America

Finally on July 1st 1881, Canada could call the USA, and thanks goes to National Bell Telephone Company of the State of Maine. Continue reading