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Speedglas welding helmet. The modern welding helmet used today was first introduced in 1937 by Willson Products. [5] In 1981, Swedish manufacturer Hornell International (now owned by 3M [6]) introduced an LCD electronic shutter that darkens automatically when sensors detect the bright welding arc, [7] the Speedglas Auto-Darkening Filter. With ...
Radio-frequency welding, also known as dielectric welding and high-frequency welding, is a plastic welding process that utilizes high-frequency electric fields to induce heating and melting of thermoplastic base materials. [1] The electric field is applied by a pair of electrodes after the parts being joined are clamped together.
The M1971 helmet (Also known as M71) is a military steel combat helmet used by Switzerland from its formal introduction in 1971 until its gradual replacement by the Schuberth B826 (known in Switzerland as the Schutzhelm 04 (in German) or casque de protection balistique 04 (in French)).
Gravity darkening, also referred to as gravity brightening, is an astronomical phenomenon where the poles of a star are brighter than the equator, due to rapid ...
Accordingly, UN peacekeepers (often referred to as Blue Berets or Blue Helmets because of their light blue berets or helmets) can include soldiers, police officers, and civilian personnel. Chapter VII of the United Nations Charter gives the United Nations Security Council the power and responsibility to take collective action to maintain ...
Federal Reserve officials held interest rates steady after their latest policy meeting, drawing sharp criticism from President Donald Trump.
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