Question: The "Dreadnought" is a type of acoustic guitar body developed by a manufacturer established in this year?
Related documents: [0]  [DOC] C.F. Martin & Company is an American guitar manufacturer established in 1833 by Christian Frederick Martin. Martin is highly regarded for its steel-string guitars and is a leading manufacturer of flat top guitars. Martin instruments can sell for thousands of dollars, and vintage instruments occasionally command six-figure prices. The company has also made mandolins as well as several models of electric guitars and electric basses, although none of these other instruments are currently in production. [END] 
[1]  [DOC] The "Dreadnought" is a type of acoustic guitar body developed by guitar manufacturer C.F. Martin & Company. The Dreadnought style, since copied by other guitar manufacturers, has become the most common of all styles of guitar bodies. [END] 
Answer: 
1833
1833