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What does the title “Assigm” mean? Is it a typo? [duplicate]

In reference to the patent: US383746 In the drawing and description it refers to the item as a "Lubricator", but the title of the patent is shown as "Assigm".
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US38119 Patent Title

I would like to know where the title "improvement in drill-bit" came from in US38119, the applicant or the USPTO. Nowhere in the text does the applicant refer to the device as a drill-bit.