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.
The first digital tape recorder was demonstrated in Japan in 1967, with the first digitally mastered records appearing on the Denon label in 1972. The first commercially available digital audio recorder was the Sony PCM-1. Introduced in 1977, the PCM-1 converted an incoming analogue signal into a digital one, which was then recorded onto a standard video cassette in a VCR. Initially, digitally mastered records were still released on vinyl disks in the analogue format. In 1982, however, Sony and Philips released the first compact discs and players. On a CD, the digital information was embodied as millions of microscopic bits in the reflective aluminum coating of the disk.