The 7J20 Patent is now in the archives
For all of you that are interested in the 7J20, Egge Siert just uploaded the entire US patent for it. It makes for interesting reading if you are interested in electro-optics, or in learning more about this unusual plugin.
Dennis Tillman W7PF
File : /7J20 Patent #3886331.pdf
Uploaded by : calibrationfixture <eggeja2@...>
Description : Addition to 7J20 & J20 Photo Album
You can access this file at the URL: