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In various patent logs, it is recorded Tesla applied for US patent #613819 for "Filings Tube" (such as Charles Henry Sewall's "Wireless Telegraphy" (New York, 1904)) but it does not seem to have been issued. [7] [8] The Nikola Tesla Museum in Belgrade archives have Tesla prepared material and drawings for patents that he never registered. [7]
Nikola Tesla's Archive consists of over 160,000 original documents and is included in UNESCO Memory of the World Programme. [278] [279] Tesla obtained around 300 patents worldwide for his inventions. [280] Some of Tesla's patents are not accounted for, and various sources have discovered some that have lain hidden in patent archives.
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