MARTIN

There are many types of support beams, but the most popular way is the X-shaped support keel. Martin Frederick Martin, the founder of Martin, first used the trapezoidal support beam design used in classical guitars. Later, Martin designed the X-shaped support keel for the gut guitar for the first time. It was not until the 1920s that Martin began to produce steel-string guitars. The internal structure of acoustic guitars began to use X-shaped support bracings. Until today, it is still the most practical and popular acoustic guitar internal support.