A metal detector is an instrument that detects the presence of metal nearby. Metal detectors are useful for finding metal inclusions hidden within objects, or metal object buried underground.
invented by John Kemp Starley
A safety bicycle (or simply a safety) is a type of bicycle that became very…
invented by James Blyth
A wind turbine is a device that converts the wind’s kinetic energy into…
invented by Paul Vieille
Poudre B was the first practical smokeless gunpowder created in 1884. It was…
invented by William Henry Perkin
Mauveine, also known as aniline purple and Perkin’s mauve, was one of the…
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