US3124991A Vibrato tuning device for stringed musical instruments
Patent drawing for Glaser guitar string bender, figure 2, patent 4354417, title Tone Changer for Stringed Instrument.
Patent drawing for Hennessey guitar string bender, figures 1, 2 and 4, patent 4658693, titled Rear operated control device for guitar.
A Patent sketch (D187,001) for the Fender Precision Bass
Diagrams of Leo Fender's lap steel guitar design from 1944 patent application, emphasizing the design of the guitar pickup.
Sketch of Leo Fender's lap steel guitar design from 1948 patent application, emphasizing design of guitar pickup.
Diagrams of the tremolo system on the Fender Stratocaster from 1954 patent application.
Patent drawing of Gibson Moderne Public domain photograph related to music, performing arts, free to use, no copyright restrictions image - Picryl description
Patent drawing for Parsons-White String Bender, figures 2, 3 and 4, patent 3,512,443, title Shoulder Strap Control for String Instruments.
A Patent sketch (D169,062) for the original Fender Precision Bass in 1951-56 (now known as Telecaster Bass)
USD164227S Guitar (1951-04-23 filed, 1951-08-14 published) by Clarence L. Fender - Fender Broadcaster, Fig. 1, 2, 3