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Chronological Distribution of Milker Patents, 1860-1910

Early attempts at developing a satisfactory pressure type milker did not give way to the likelier prospect of a vacuum milker until well into the 20th century. Instead, both pressure and vacuum type milkers were patented at about the same rate during thirty years of active development.

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© 1996, Greybird Publishing
From "American Milking Machines" by Richard Van Vleck