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<p>[QUOTE=&quot;Dawnno, post: 629160, member: 10171&quot;]Great spot... and, the date is very useful, since the Patent also EXPIRES (formerly in 17 years) so the use of the date on the mechanism then can give you an approx range, since no mfr would go to the trouble of marking an expired patent.&nbsp; So 1873 - 1890 or so, if the mechanism was put on during the time the chair was made, and so it would appear.</p><p><br /></p><p>I would speculate &#039;earlier than later&#039; in the range, just b/c improvements always come along.[/QUOTE]</p><p><br /></p>

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