Question: The Cygnet was a powered version of the  tetrahedral kite designed by a Scottish-born scientist, inventor, engineer, and innovator who is credited with founding what in 1885?

Context paragraphs:
Carl H. Claudy: Carl Harry Claudy (1879–1957) was an American magazine writer, a journalist for the New York Herald and author of a number of books relating to photography and to aviation, including First Book of Photography: A Primer of Theory and Prize Winners' Book of Model Airplanes.  During the early 1900s, Claudy photographed many important aeronautical events such as Alexander Graham Bell's tetrahedral kite experiments and the Wright Flyer Army Trials at Fort Meyer, Virginia.  Claudy wrote many science fiction stories for "The American Boy" magazine during the early 1930s.  Four novelization books were printed from some of those stories.  From 1939-1941, he wrote for DC Comics.  He was also a Masonic leader, speaker, playwright, and essayist.  He wrote several handbooks for Masons.

Alexander Graham Bell: Alexander Graham Bell (March 3, 1847 – August 2, 1922) was a Scottish-born scientist, inventor, engineer, and innovator who is credited with patenting the first practical telephone and founding the American Telephone and Telegraph Company (AT&T) in 1885.

Arc kite: The arckite or twinskin kite is a type of traction kite designed and patented by Peter Lynn.  It is a very stable, safe and secure type of powerkite.  It can be used for all kinds of kite powered sports, for example: kiteboarding, landboarding, kite buggying or snowkiting.  The shape of the kite is similar to a C shaped leading edge inflatable kite, however the construction is similar to a foil kite.  These kites also fall into a category of foils called "closed-cell inflatables", meaning that the ram-air inlets on the leading edge of the kite are normally closed by flaps that act as one-way valves to maintain internal air pressure.  It is this feature that makes the kite useful for kitesurfing since, unlike standard open-cell foils, if the kite crashes on the water, it will stay inflated and float long enough for the rider to recover and re-launch.

Power kite: A power kite or traction kite is a large kite designed to provide significant pull to the user.

Hafner Rotachute: The Hafner H.8 Rotachute was a British 1940s experimental one-man rotor kite designed by Raoul Hafner.

Hector's clingfish: Hector's clingfish, "Gastroscyphus hectoris", is a clingfish of the family Gobiesocidae, the only species in the genus Gastrocyathus.  It is found all down the east coast of New Zealand around the low water mark amongst seaweed, on rocky coastlines.  Its length is up to 6.4 cm SL.  It is named after Scottish-born scientist James Hector.

Bell Oionus I: The Oionus I was a tetrahedral triplane built for Alexander Graham Bell It was the culmination of Bell's experiments with kites built at Baddeck, Nova Scotia.  The aircraft's design combined those of the Aerial Experiment Association (AEA)'s AEA Silver Dart biplane and his AEA Cygnet kite.  It was Bell's final aviation pursuit and Canada's first and only triplane design.  The aircraft attempted a test flight in March 1910, but failed to achieve flight.

Tetrahedral kite: A tetrahedral kite is a multicelled rigid box kite composed of tetrahedrally shaped cells to create a kind of tetrahedral truss.  The cells are usually arranged in such a way that the entire kite is also a regular tetrahedron.  The kite can be described as a compound dihedral kite as well.

AEA Cygnet: The Cygnet (or Aerodrome #5) was an extremely unorthodox early Canadian aircraft, with a wall-like "wing" made up of 3,393 tetrahedral cells.  It was a powered version of the Cygnet tetrahedral kite designed by Dr Alexander Graham Bell in 1907 and built by the newly founded Aerial Experiment Association.

Man-lifting kite: A man-lifting kite is a kite designed to lift a person from the ground.  Historically, man-lifting kites have been used chiefly for reconnaissance and entertainment.  Interest in their development declined with the advent of powered flight at the beginning of the 20th century.

Supporting paragraphs: AEA Cygnet Alexander Graham Bell
Answer: American Telephone and Telegraph Company