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Drawing of

Guitar Construction

US4056034 1977 Charles H. Kaman US Guitar soundboard construction with relocated sound openings and improved bracing 9 drawings

Patent for a guitar body design featuring two discrete sound openings located on either side of the longitudinal center line in the upper bout, replacing the conventional single center sound hole. This construction allows for a thinner sound board with improved bracing patterns, enabling better acoustic response particularly in the first and second harmonic modes of vibration. The design is foundational to the Ovation Adamas guitar series.

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