Harry Brearley
Harry Brearley (18 February 1871 – 14 July 1948) was an English metallurgist, usually credited with the invention of "rustless steel" (later to be called "stainless steel" in the anglophone world).
Manganin
In 1887 Edward Weston discovered that metals can have a negative temperature coefficient of resistance, inventing what he called his "Alloy No. 2." 
It was produced in Germany where it was renamed "Constantan".
In 1892 Weston had finally completed his discovery of an alloy 
of copper, nickel, and manganese prepared by a complicated series 
of heat-treatments. In May, 1893, he received a basic patent on the 
composition, manufacture, and use of the material for electrical 
resistors. Production was carried out in Germany, and it 
became known as "Manganin".
The availability of a practical conductive metal with an extremely
constant resistance over the range of ordinary temperatures
was a great advance in electrical technology and equipment design,
but Weston did not receive general recognition for this.