Waldo Semon
1898–1999
Jména a Příjmení
والدو سمون, 沃爾多·塞蒙, 沃尔多·塞蒙, 瓦勒度·L·塞蒙, Уалдо Семон, Ուալդո Սեմոն, Waldo Lonsbury Semon, Семон, Уалдо
Časová osa
Biografie
American inventor (1898–1999)
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