Ink and Screened 18×24″ Headphone Patent for $17 w/FS [MD]

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.