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National String Instrument Corporation

The National String Instrument Corporation was an American guitar company first formed to manufacture banjos and then the original resonator guitars. National also produced resonator ukuleles and resonator mandolins. The company merged with Dobro to form the "National Dobro Company", then becoming a brand of Valco until it closed in 1968.

The first[clarification needed] company was formed by George Beauchamp, a vaudeville steel guitar player and house painter, and inventor John Dopyera, a violinist and luthier.

Dopyera had seen an amplified Stroh stick violin nearby[clarification needed] with a small flat diaphragm and long attached horn. He used that initial idea, but with a large spun conical inverted speaker, to create his patented multiple resonator designs.[citation needed]

Dopyera was assisted with his nephews Paul and Carl Barth spinning the first aluminum diaphragms on wooden bucks. They first experimented with their novel ampli-phonic design in a large walnut console instrument. Soon afterwards the first German silver Hawaiian guitar was built by John and Rudolph Dopyera. This guitar, #101, was later modified with a mahogany Spanish neck for regular guitar playing.

Beauchamp had suggested to Dopyera the need for a guitar loud enough to play a melody over brass and other wind instruments.[failed verification]

In 1927, National produced the first resonator instruments and sold them under their National brand. They had metal bodies and a tricone resonator system, with three aluminium cones joined by a T-shaped aluminium spider.

Brother Rudolph Dopyera, who previously worked with Weissenborne, hand built the original tri-cone models with diamond holes, prior to the second production stamped metal bodies by engineer Adolph Rickenbacher. They built metal resophonic mandolins, tenor guitars and ukuleles, some of which were ornately engraved with rose, lily of the valley and chrysanthemum designs.

Wooden-bodied Triolian and Trojan single resonator models eventually followed once the Dopyera brothers departed, based on inexpensive plywood student guitar bodies supplied by Kay, Harmony, and other established instrument manufacturers.

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