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Thermos L.L.C. - Wikipedia

Thermos as a trademark. The word "thermos" is a genericized trademark used as a name for a vacuum flask. From around 1910 till 1922, Thermos strove for this synonymity, as it was considered free advertising; the value of such advertising was estimated, in 1917, at between $3 and $4 million worth in American dollars alone.

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