Concetto:Patented in 1920
Descrizione del concetto "Patented in 1920"Feed RDF
Patents registered in 1920
[[Categoria:Patents]] [[Patent date::≥1 gennaio 1920]] [[Patent date::≤31 dicembre 1920]]
P
- File:Patent-AT-81466B.pdf +
- File:Patent-DE-326796.pdf +
- File:Patent-FR-498271.pdf +
- File:Patent-FR-498272.pdf +
- File:Patent-FR-503751.pdf +
- File:Patent-FR-505917.pdf +
- File:Patent-FR-526081.pdf +
- File:Patent-GB-141071.pdf +
- File:Patent-GB-141075.pdf +
- File:Patent-GB-146632.pdf +
- File:Patent-GB-151753.pdf +
- File:Patent-GB-151844.pdf +
- File:Patent-IT-174083.pdf +
- File:Patent-US-1328215.pdf +
- File:Patent-US-1334332.pdf +
- File:Patent-US-1335580.pdf +
- File:Patent-US-1336119.pdf +
- File:Patent-US-1336572.pdf +
- File:Patent-US-1339359.pdf +
- File:Patent-US-1340277.pdf +