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GB114282A
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Improvements in the Method of Working Refractory Metals.
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|
GB111569A
|
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Improvements in the Manufacture of Filaments for Incandescent Electric Lamps.
|
|
DE322306C
|
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Electric light bulb
|
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DE322303C
|
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Process for the production of wires from tungsten or the like.
|
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GB190906936A
|
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Improvements in Processes for Manufacturing Metal Filaments for Incandescent Electric Lamps.
|
|
GB190814942A
|
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Improved Process for the Production of Tungsten Filaments for Electric Incandescent Lamps.
|
|
GB190806245A
|
|
Improvements in Metal Filament Electric Lamps.
|
|
GB190718923A
|
|
Improvements relating to Electric Incandescent Lamps.
|
|
GB190718922A
|
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Improvements relating to the Production of Tungsten Dioxide.
|
|
GB190713882A
|
|
Improvements in Incandescent Electric Lamps.
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