(Q128594449)

English

Improvement in Telegraphing

1872 scan

United States patent 129971

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Improvement in Telegraphing (English)

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edition or translation of

Improvement in Telegraphing

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publication date

30 July 1872^Gregorian

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full work available at URL

https://patents.google.com/patent/US129971A/en

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document file on Wikimedia Commons

United States patent 129971.pdf
1,158 × 1,702; 107 KB

title page number

1

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https://en.wikisource.org/wiki/Index:United_States_patent_129971.pdf

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United States patent 129971

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