7/26/2019 U.S. Patent 2,683,388, entitled "Pickup device for stringed instruments" to Keller, issued 1954.

http://slidepdf.com/reader/full/us-patent-2683388-entitled-pickup-device-for-stringed-instruments-to 1/4

7/26/2019 U.S. Patent 2,683,388, entitled "Pickup device for stringed instruments" to Keller, issued 1954.

http://slidepdf.com/reader/full/us-patent-2683388-entitled-pickup-device-for-stringed-instruments-to 2/4

7/26/2019 U.S. Patent 2,683,388, entitled "Pickup device for stringed instruments" to Keller, issued 1954.

http://slidepdf.com/reader/full/us-patent-2683388-entitled-pickup-device-for-stringed-instruments-to 3/4

7/26/2019 U.S. Patent 2,683,388, entitled "Pickup device for stringed instruments" to Keller, issued 1954.

http://slidepdf.com/reader/full/us-patent-2683388-entitled-pickup-device-for-stringed-instruments-to 4/4