Phoropter
Trademark
Phoroptor is a registered trademark name currently owned by Reichert Technologies, filed Apr 25, 1921 with the USPTO, serial number 71146698. The common name is refractor. The current version is named "Ultramatic RX Master Phoroptor".
See also
References
Retrieved from : http://en.wikipedia.org/w/index.php?title=Phoropter&oldid=458838796
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