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Electric incandescent lamp having a metal cap welded to a...

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Electric incandescent lamp having a pinched base

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Electric incandescent lamp having a tungsten-bromine cycle

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Electric incandescent lamp of the infra-red type having...

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Electric incandescent lamp with ellipsoid-shaped envelope

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Electric incandescent lamps

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Electric incandescent lamps

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Electric incandescent lamps

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Electric incandescent lamps

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Electric incandesdent lamp having a tungsten-bromine cycle

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Electric lamp

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Electric lamp

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Electric lamp

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Electric lamp

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Electric lamp

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Electric lamp

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Electric lamp

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Electric lamp

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Electric lamp and an illuminating system having such an...

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Electric lamp apparatus having diffusion barrier

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