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A portion of the disclosure of this patent document contains material which is subject to (copyright or mask work) protection. The (copyright or mask work) owner has no objection to the facsimile reproduction by anyone of the patent document or the patent disclosure, as it appears in the Patent and Trademark Office patent file or records, but otherwise reserves all (copyright or mask work) rights whatsoever.
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{{Information |Description=Patent drawings of optical comparator invented by James Hartness and Russell Porter |Source=Patent #1,703,933 |Date=March 5, 1929 |Location=U.S. Patent Office |Author=Hartness, James and Porter, Russell |Permission=Work of U.S.
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