Figure 4: This figure describes how to find location for unreadable patent documents. | Scientific Data

Figure 4: This figure describes how to find location for unreadable patent documents.

From: Unveiling the geography of historical patents in the United States from 1836 to 1975

Figure 4

We use here a set of patents invented by Alexander Graham Bell as an example. Patent numbers at the top of the figure correspond to documents for which a location couldn’t be found, while blue coloured dots represent patent documents with an identified location from step 2. The division between unreadable and readable patents is only for illustrative purposes. All of these patents contain an assigned location from step 2. Lines connecting unreadable patents with blue dots mean those patents share the same inventor name (i.e., Alexander Graham Bell). We can connect those blue dots with found locations to create a geo-referenced database of unreadable OCR text.

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