Coupling device for connecting a lifting device to a load
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Protective device for welding apparatus
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Automatic eye and spray protection screen for arc welding appts. - where arc voltage can only be applied to electrodes when window in screen is covered by safety glass
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Eye and spray protection screen for arc welding appts. - where light from arc or sound waves from human breath automatically move coloured glass over window in screen
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Electrically-automatic anti-glare device
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Inrush effect minimisation elimination or damping circuit - has ballast resistor of optimum size to limit inrush current
