Image: US Patent 661,619 - Magnetic recorder
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Description: Figure 1 of United States Patent 661,619 by Danish inventor Valdemar Poulsen - the first magnetic recorder.
Title: US Patent 661,619 - Magnetic recorder
Credit: United States Patent Office.
Author: United States Patent Office, Valdemar Poulsen inventor.
Permission: Public domain - original work of the US Federal Government. All text and figures in US Patents are in the public domain.
Usage Terms: Public domain
License: Public domain
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