Concetto:Patented in 1920
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Descrizione del concetto "Patented in 1920"Feed RDF
Patents registered in 1920
[[Categoria:Patents]] [[Patent date::≥1 gennaio 1920]] [[Patent date::≤31 dicembre 1920]]
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- File:Patent-US-1342736.pdf +
- File:Patent-US-1344434.pdf +
- File:Patent-US-1346045.pdf +
- File:Patent-US-1347800.pdf +
- File:Patent-US-1347901.pdf +
- File:Patent-US-1348211.pdf +
- File:Patent-US-1349025.pdf +
- File:Patent-US-1350412.pdf +
- File:Patent-US-1351552.pdf +
- File:Patent-US-1351564.pdf +
- File:Patent-US-1351574.pdf +
- File:Patent-US-1351575.pdf +
- File:Patent-US-1351591.pdf +
- File:Patent-US-1357083.pdf +
- File:Patent-US-1358511.pdf +
- File:Patent-US-1359880.pdf +
- File:Patent-US-1360647.pdf +
- File:Patent-US-D055515.pdf +
- File:Patent-US-D056681.pdf +