Question: What company was founded by Julius Kahn in Detroit, Michigan?

Context paragraphs:
Julius Kahn (inventor): Kahn was born in Münstereifel, Germany, March 8, 1874.  He was raised in Detroit, Michigan.  Kahn came to Detroit in 1881 from Germany with his family (five brothers and two sisters) when he was six years old, settling first in Baltimore, Maryland in 1880.  His father Joseph (1860–1924) was a rabbi and ran a restaurant.  Kahn helped in his father's restaurant business and sold newspapers.  His mother Rosalie was skilled in music and art.  Kahn went to the Detroit Public Schools where he received his elementary schooling, doing the normal four-year high school in three years.

Military Surplus Act (Kahn–Wadsworth Act): The Military Surplus Act (or Kahn-Wadsworth Act) was signed into US law by the 66th US Congress in 1920.  Sponsored by Representative Julius Kahn (R) of California and Senator James Wolcott Wadsworth, Jr. (R) of New York, it distributed 25,000 surplus army trucks to state highway departments for road-building purposes.

Julius Kahn (congressman): Julius Kahn (February 28, 1861 – December 18, 1924) was a United States Congressman who was succeeded by his wife Florence Prag Kahn after his death.  Kahn was born in Kuppenheim, in the Grand Duchy of Baden, in what would become Germany.

Hy-Rib: Hy-Rib was a brand name for a product manufactured by the Trussed Concrete Steel Company.  It is an engineering reinforcement system for floors, walls, and ceilings of buildings and houses.  This product is a derivative of the Kahn Trussed Bar for beams and columns that was invented by Julius Kahn.  Kahn engineered the Hy-Rib products and they were first manufactured in 1909.

Florence Prag Kahn: Florence Prag Kahn (November 9, 1866 – November 16, 1948) was an American teacher and politician who in 1925 became the first Jewish woman to serve in the United States Congress.  She was only the fifth woman to serve in Congress, and the second from California, after fellow San Franciscan Mae Nolan.  Like Nolan, she took the seat in the House of Representatives left vacant by the death of her husband, Julius Kahn.

Kahn System: The Kahn System is an industrial construction technique for reinforcement of buildings that was engineered and patented by Julius Kahn.  The Kahn system is an industrial construction design using the Kahn Trussed Bar as the bases.  This steel bar was a new type of reinforcing bar used in concrete and had unique engineered features to distribute stress.

National Defense Act of 1920: The National Defense Act of 1920 (or Kahn Act) was sponsored by United States Representative Julius Kahn, Republican of California.  This legislation updated the National Defense Act of 1916 to reorganize the United States Army and decentralize the procurement and acquisitions process for equipment, weapons, supplies and vehicles.  It was passed by Congress on June 4, 1920.

Trussed Concrete Steel Company: The Trussed Concrete Steel Company was a company founded by Julius Kahn, an engineer and inventor.  The company manufactured prefabricated products for reinforced concrete beams and steel forms for building reinforced concrete floors and walls.  Kahn invented and patented a unique new technology reinforcement system of construction called the Kahn System that was stronger, more economical, and lighter than the existing old school technology used up to that point to construct buildings.  The old method was to use plain straight smooth steel beams or loose rods or stirrups in concrete beams and floors.  Kahn's new technology improved system used 45 degree tab flanges or "wings" permanently attached on steel beams that distributed the tension stress for overall improvement in strength of reinforced concrete.

Truscon Laboratories: Truscon Laboratories was a research and development chemical laboratory of the Trussed Concrete Steel Company ("Truscon") of Detroit, Michigan.  It made waterproofing liquid chemical products that went into or on cement and plaster.  The products goals were to provide damp-proofing and waterproofing finishing for concrete and Truscon steel to guard against disintegrating action of water and air.

Albert Kahn Associates: Albert Kahn Associates is an architectural design firm in Detroit, Michigan with a second office located in São Paulo, Brasil.  It was established in 1895 and is still active today.  It introduced a new technology in industrial building involving a unique reinforced concrete method referred to as the Kahn System of construction using proprietary patented reinforcement steel manufactured by Trussed Concrete Steel Company.  The building of automobile factories and other types of factories were revolutionized from wooden timber framing construction.  Besides being an advanced technology in strength that led to wider open interior spaces, it featured a high degree of fire resistance and larger window space for light.  The firm started by Albert Kahn built factories for Chrysler for over a decade, Ford Automobile for 30 years and Packard Automobile for 35 years.  Other important clients of the firm were Republic Steel and General Motors.  The firm was awarded a $40 million dollar contract to build a tractor factory in Russia in 1928.  The firm's output was over a million dollars worth of work per week by 1929.  By 1939, the firm designed 19 percent of all industrial buildings in the United States and had designed some $800 million of buildings worldwide.  Currently, Albert Kahn Associates is still making history with state-of-the-art projects.  Recent projects include creating the world's largest penguin conservatory,located at the Detroit Zoo, which opened in 2016.

Supporting paragraphs: Truscon Laboratories Trussed Concrete Steel Company
Answer: Trussed Concrete Steel Company