File:HartnessComparator.jpg

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Summary

Description
English: Patent drawings (edited for simplicity) of optical comparator invented by James Hartness and Russell Porter
Date
Source Patent #1,703,933
Author Hartness, James and Porter, Russell
Permission
(Reusing this file)
U.S. Patent (expired)
Location
InfoField
U.S. Patent Office

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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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01:27, 13 April 2008 1,079 × 658 (253,857 bytes) w:en:HopsonRoad (talk | contribs) {{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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5 March 1929Gregorian

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current17:58, 10 April 2020Thumbnail for version as of 17:58, 10 April 20201,079 × 658 (248 KB)Hippymoose17Transferred from en.wikipedia: see original upload log above
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