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After the Chicago Meet they toured the middle-west and southern states. When the season closed, Harry returned to the West Coast and started to take flight instructions from Howard Gill on a Burgess-Wright Model "F" plane at Dominguez Field, Los Angeles. The Burgess Co. had opened a winter school there, with Gill as instructor. Before Harry could complete his course, Gill had a bad crash and wrecked the plane, which ended Harry's instruction [[strike through]] for all [[strike through]]at that time. He [[strike through]]then [[strike through]]returned to Portland and joined his brother Silas, who[[strike through]] meanwhile [[strike through]] had taught himself to fly. Harry and Silas [[strike through]]jointly [[strike through]] acquired a Curtiss pusher plane from Norman DeVeaux, a West Coast automobile manufacturer, and together [[strike through]]they laid [[strike through]]the brothers made plans for the 1912 season. [[strike through]]There [[strike through]]  Harry helped prepare for the celebrated "surprise flight". Silas [[strike through]]made from [[strike through]]took off from a crude board runway they  on the roof of the Hotel Multnomah in Portland on June 11th, 1912. [[strike through]] Taking off from a crude board runway they had built on the roof. Silas [[strike through]]He flew over the city, and then about eight miles to Vancouver, Washington, where he landed. This was a daring feat [[strike through]]to say the least, but he made it and[[strike through]] that gained nationwide publicity.

Following this [[strike through]]flight [[strike through]] Harry proceeded to Vancouver, Washington, and on the site which later became Pearson Field, he taught himself to fly [[strike through]]on [[strike through]] the Curtiss biplane. By patient ground-hopping he succeeded in making his first solo flight after a few days of practice. He and Silas then toured the Northwest for the remainder of the season, making exhibition flights. Later they fitted floats to their plane and did considerable flying from the water. That fall the brothers successfully enjoyed [[strike through]] the new sport of [[strike through]]hunting ducks while flying from the water at Portland. During the latter part of the summer they bought a second Curtiss-type plane with Curtiss motor, from the Paterson Aeroplane Co. of San Francisco. The week of October 12th, 1912, Harry flew at the Ontario, Oregon Fair, dressed as the "Aerial Cowboy."

In early November, 1912, an advertisement appeared in the aviation magazines: "Christofferson Aeroplanes. Biplanes of all types built to order, passengers carried - pupils trained, at Portland, Oregon." Later that month and announcement was made that they were moving their business to San Francisco [[strike through]]CAL [[strike through]].  There they [[strike through]]company[[strike through]]  started [[strike through]] to operate [[strike through]]in a small factory on Van Ness Avenue and [[strike through]] established [[strike through]]also operated a "Hydro Haven" at Harbor View.  That month the Christofferson Aviation Company, Inc. was formed and their advertisement appeared in the January, 1913, magazines. For their first project, work was started on two Christofferson-designed flying boats. Their [[strike through]]flying [[strike through]]school opened with two students, Charles
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