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Jel Sert was created in 1926.
It is a brand name held by the company Jel Sert
Misia Sert died in 1950.
Misia Sert was born in 1872.
It can be either. Usually, when it's a noun, the accent is on the first syllable. When it's a verb, the accent is on the second syllable.
Please in-SERT the IN-sert.