UPDATE: I forgot to mention in the original post, but there are a lot of guitars in the patent prints below…
Would you like a headphone patent on your wall? Good for the next three days and change (from blog-posting date) Massdrop is offering Ink and Screened 18×24 inch Patent Prints for $17 with free US shipping. One of them is the 1981 Jacobsen and Thomsen headphone patent from KOSS [check Google Patents for more details on the actual patent]. The headphone print is just one of the many options.
These will ship in early April 2018 from the vendor and all sales are final.
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