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BOSTON:
LITTLE, BROWN, AND COMPANY.

18 6 7.

Entered according to Act of Congress, in the year 1867, by

GEORGE TICKNOR CURTIS, in the Clerk's Office of the District Court for the Southern District of New York.

UNIVERSITY PRESS : Welch, Bigelow, & Co.,

CAMBRIDGE.

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AFTER the lapse of thirteen years from the first publication of this treatise, the advances that have been made in the Patent Law have rendered it necessary substantially to rewrite the entire work. It is now, however, cast in such a form that future editions, if they should be called for, will probably require only the addition of subsequent adjudications, unless there shall be great changes introduced into the statute law. Although a revision and consolidation of the patent acts would be a public benefit, it is to be hoped that, when such a code is undertaken, its text will be founded carefully on the existing statutes, explained by the judicial interpretation which they have received. Extensive changes in the present system do not seem to me to be demanded.

For the convenience of those who use this work, I have added an Index to the subjects of the inventions which are referred to in the text or the notes.

In carrying this edition through the press, I have received valuable assistance from Mr. James Morgan Hart, of the New York bar.

New YORK, August, 1867.

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