L. HAND, Circuit Judge.
The patent is for an improvement in a printing head used for consecutive numbering. Its purposes as declared are to prevent the adjacent digit wheels from sticking together when one is moved, and from being "overrotated or otherwise moved at improper times." There had been earlier efforts in such machines to hold the wheels which were not to be moved, but the invention was for a double lock, primarily, a separate detent for each wheel, locked...
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