(Q122855829)

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Statements

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Kolpulvermikrofon (Swedish)

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Lars Magnus Ericsson

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publication date

11 September 1889^Gregorian

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document file on Wikimedia Commons

Swedish patent 1828 Kolpulvermikrofon.pdf
1,239 × 1,752, 4 pages; 199 KB

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12 November 1888^Gregorian

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Wikisource index page URL

https://sv.wikisource.org/wiki/Index:Swedish_patent_1828_Kolpulvermikrofon.pdf

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