GB190621513A - Process and Apparatus for the Treatment of Metallic Tungsten and for the Manufacture of Electric Lamp Filaments therefrom
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Process and Apparatus for the Treatment of Metallic Tungsten and for the Manufacture of Electric Lamp Filaments therefrom
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British Thomson Houston Company Ltd The
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Individual
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Individual
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GB190621513D1906-09-281906-09-28Process and Apparatus for the Treatment of Metallic Tungsten and for the Manufacture of Electric Lamp Filaments therefrom
ExpiredGB190621513A
(en)