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Original Message
Does any one know if the out of patent Heil waveguide is being produced and sold?
Posted by Rafaro on June 1, 2017 at 07:51:49:
Dr Christian Heil landmark HF line array waveguide has been out of patent protection since 2012. Does anyone know if its being produced and sold by anybody?
https://www.google.com/patents/US5163167
thanks