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resigned on August 17, 1917 and returned to California. The following month a group of Cleveland, Ohio, business men financed Martin to form a new Glenn L. Martin Company [[strikethrough]] there [[/strikethrough]] at Cleveland, and a new factory and flying field were made ready for World War I aircraft production. At this time Martin was requested to give up flying and apparently never flew again as a pilot.

Martin persuaded Douglas to return as Chief Engineer and work was started on a twin Liberty-engined bomber. Although too late for wartime production it was first flown in September, 1918, and proved to be a very advanced machine. [[strikethrough]] which soon found post war use and [[/strikethrough]] Several notable records were made with these famous planes after the war. Martin was [[strikethrough]] clearly [[/strikethrough]] firmly established as a prime contractor of military aircraft. The Cleveland business grew and many [[strikethrough]] eminent [[/strikethrough]] progressive developments came [[strikethrough]] from there [[/strikethrough]] for both the Army and Navy. [[strikethrough]] services [[/strikethrough]] [[Strikethrough]] He brought out and [[/strikethrough]] Martin produced torpedo planes, bombers, submarine scouts, observations types, and special planes for the Air Mail Service. In 1922 the first Navy all-metal monoplanes and seaplanes were introduced. At Cleveland with Martin were Donald Douglas, Larry Bell and J.A. Kindelberger, who later became head of North American in California, and Erik Springer, [[strikethrough]] their [[/strikethrough]] was well known as a test pilot. Martin bombers were used in the historic [[strikethrough]] General Mitchell [[/strikethrough]] sinking of [[strikethrough]] discarded [[/strikethrough]] surrendered German [[strikethrough]] vessels [[/strikethrough]] warships [[strikethrough]] off the Virginia coast in 1921, under the leadership of General "Billy" Mitchell. 

At Cleveland, Martin's organization [[strikethrough]] became master of [[/strikethrough]] developed mass production techniques and [[strikethrough]] sizable [[/strikethrough]] large numbers of aircraft were built. By 1928 the facilities were overcrowded and the limit of possible expansion in that location had been reached. Martin [[strikethrough]] wanted [[/strikethrough]] decided to leave Cleveland. [[strikethrough]] so [[/strikethrough]] He chose Baltimore [[strikethrough]] to be [[/strikethrough]] because it was near Washington, D.C. [[strikethrough]] and because of the unlimited expanse of [[strikethrough]] for government contacts, and also close to Chesapeake Bay where he could test the large seaplanes he had in mind.

The Cleveland plant was sold to the Great Lake Aircraft Corporation and Marin bought 1,200 acres of water-front land at Middle River, 12 miles east of Baltimore. The land was cleared and one of the finest aircraft factories in the Unites States was built, then an airport was established adjoining the plant. On October 7 [[strikethrough]] th [[/strikethrough]], 1929, his staff and 1,500 employees moved into the new plant of the Glenn L. Martin Company of Baltimore, where he truly made aviation history.

During the years before World War II the Martin Company developed and [[strikethrough]] produced [[/strikethrough]] manufactured 

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