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and was entered in the U.S. Army [[strikethrough]] military [[/strikethrough]] aircraft competition held in October at San Diego, [[strikethrough]] Cal [[/strikethrough]]. Several notable cross-country flights were made with this plane. 

In the early spring of 1915, the brothers brought out a new flying boat, using many of the same components as the Military Tractor, and powered by a Sturtevant 100 [[strikethrough]] HP [[/strikethrough]] engine. They were also operating a daily flying boat passenger-carrying service at the Panama-Pacific Exposition waterfront. [[strikethrough]] and there [[/strikethrough]] Harry was in charge of this service [[strikethrough]]doing a satisfactory business [[/strikethrough]]. He was also in charge of the school and had gained an enviable reputation for his safe flying. That spring, Lansing Travis, who was a student and one of the business associates of the Company, went [[strikethrough]] made a trip [[/strikethrough]] to Mexico where he obtained an order for one plane which kept the factory busy. Also, the brothers were working on a new engine of their own design. In August the factory was moved to Oakland, California to get more [[strikethrough]] factory [[/strikethrough]] space. During 1915 Harry taught [[strikethrough]] a great [[/strikethrough]] many students, some of whom went on to become well known aviators, including Joe Bocquelle who purchased a small, specially built Christofferson Looping-Biplane, with a Gnome engine, for exhibition work. In early December, the brothers announced their new Christofferson aircraft engine, a 6 cylinder, liquid-cooled engine [[strikethrough]] unit [[/strikethrough]] developing 120 [[strikethrough]] HP [[/strikethrough]] hp at 1400 [[strikethrough]] RPM [[/strikethrough]] rpm and weighing 460 lbs. This engine later passed official tests in April, 1916. 

In January, 1916 the Christoffersons [[Christofferson's]] relocated their flying school, using a field near Oakland where they built hangars to accommodate several planes. [[strikethrough]] Their school was busy [[/strikethrough]] That spring they had [[strikethrough]] a large class of students, including several Canadians who were training to enlist in the [[strikethrough]] English [[/strikethrough]] Royal Flying Corps. [[strikethrough]] Also, [[/strikethrough]] During the winter months of 1915-1916 Harry conducted a passenger-carrying business at Long Beach, California. [[strikethrough]] During this operation [[/strikethrough]] He also did some flying for the movies and was in the old-time silent thriller "The Hazards of Helen." There an ambitious youngster fast-talked Harry into giving him a free ride. [[strikethrough]] Many [[/strikethrough]] Years later Harry learned [[strikethrough]] he discovered [[/strikethrough]] that the boy was [[strikethrough]] Captain [[/strikethrough]] Frank Hawks who [[strikethrough]] later [[/strikethrough]] became an internationally famous aviator. 

The Christofferson Motor Co. of Redwood City, California, was incorporated in May, 1916, to build and market their aircraft engine; [[strikethrough]] and [[/strikethrough]] a 12 cylinder Vee engine was also under development [[strikethrough]] projected [[/strikethrough]]. In June they received an order from the Chinese Government for 25 planes. In July Frank Bryant became their school instructor and a class of 15 students was enrolled. Two other Christofferson brothers, Harvey and Goodsell, joined [[strikethrough]] also worked for [[/strikethrough]] the Company and both learned to fly [[strikethrough]] and [[/strikethrough]]

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