The U.S. Patent Office opened in 1838 it has granted more patents for mouse traps
than for any other invention.
A) 1838, it B) 1838; it C) no change
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The U.S. Patent Office opened in 1838 it has granted more patents for mouse traps
than for any other invention. A) 1838, it B) 1838; it C) no change
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