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  • Group logo of Brochure Display Stands - Invaluable Or Obsolete? 1
    active 2 weeks, 6 days ago

    Next came Dr. Leo Baekeland. In 1909, he secured site directories . patent for phenol- formaldehyde, which he combined to form a resinous substance, a phenolic plastics. He called it ”Bakelite”. This material […]

    Public Group

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