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A gas laser is a laser in which an electric current is discharged through a gas to produce light. The first gas laser, the Helium-neon, was co-invented by Iranian physicist Ali Javan and American physicist William R. Bennett, Jr. in 1960. Nowadays, gas laser is widely used.
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A rivet is a permanent mechanical fastener. Before it is installed it consists of a smooth cylindrical shaft with a head on one end. The end opposite the head is called the buck-tail. On installation the rivet is placed in a punched or pre-drilled hole.
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Tungsten disc is mainly used in electrical system, such like in electric light divise, relay, circuit breaker, switch series, electric vacuum components and starter etc;