Since the invention of Ductile Iron, also known as Spheroidal Graphite Iron or Nodular Cast Iron in 1949, it has become the most preferred pipe material for water supply and pressure sewerage applications around the world.ince the invention of Ductile Iron, also known as Spheroidal Graphite Iron or Nodular Cast Iron in 1949, it has become the most preferred pipe material for water supply and pressure sewerage applications around the world.
The 1994 Federal Register TRI listing of chlorsulfuron (59 FR 1788, January 12, 1994) also cited a slight treatment-related decrease in maternal fertility in the F3 generation observed in a rat chronic toxicity study (Ref.
These latter dates, which have been included below, are to confirm that Imperial did, in fact, secure registration. 1901 - On November 7, 1901 affidavits were filed with the Secretary of State of West Virginia for incorporation of the Imperial Glass Company. On Nov. 14, 1901 incorporation was approved.