Who, what, why: Are machine-written signatures binding? - BBC News
Sincerely Yours, This Machine Does Not Exist
Autopen machines: How do they work? - collectSPACE: Messages
Obama under fire for using 'unconstitutional' autopen to sign a bill | Daily Mail Online
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Autopen Sales & Service | Automated Signature Technology
How to spot autopen autographs
White House aides use autopen to sign highway bill while Obama is overseas
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Seth MacFarlane Uses Auto-Pen for Orville Autograph Cards
When a Robot Signs a Bill: A Brief History of the Autopen - The Atlantic