in the presence of aluminium sulfide

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    2503168

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    • Issue date Apr 4, 1950
    • B25 - HAND TOOLS PORTABLE POWER-DRIVEN TOOLS MANIPULATORS
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    2481880

    • Patent number 2,481,880
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    • Patent number 2,238,103
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    • Issue date Dec 22, 1931
    • C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...
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