MR. JUSTICE GRAY delivered the opinion of the court.
This is a bill in equity for the infringement of letters patent granted April 18, 1882, to Nathan Rosenwasser for improvements in percolators, with the following specification and claim:
"My invention relates to percolating apparatus to be employed for filtering purposes, or for making fluid extracts or decoctions, and it consists in a device constructed and adapted to operate substantially in the manner...
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