This signature is believed to be ineligible for copyright and therefore in the public domain because it falls below the required level of originality for copyright protection both in the United States and in the source country (if different). In this case, the source country (e.g. the country of nationality of the signatory) is believed to be United States of America.
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Uploaded a work by William Cumback from https://books.google.com/books?id=7WMfAQAAMAAJ&pg=PA167&lpg=PA167&dq=%22William+Cumback%22+AND+%22state+senate%22&source=bl&ots=iX6dUHNLl-&sig=ACfU3U3ll7zP7URdYx1hcgNqmfUlPG1Bpg&hl=en&sa=X&ved=2ahUKEwjrpvCMirP3AhVTp3IEHbkXAEcQ6AF6BAgREAM#v=onepage&q=%22William%20Cumback%22%20AND%20%22state%20senate%22&f=false with UploadWizard