U.S. Patent 2,683,388, entitled "Pickup device for stringed instruments" to Keller, issued 1954.
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 1/4
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Transcript of U.S. Patent 2,683,388, entitled "Pickup device for stringed instruments" to Keller, issued 1954.
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
