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436 <strong>Suppressed</strong> <strong>Inventions</strong> <strong>and</strong> Other <strong>Discoveries</strong><br />

Tesla's perfected system <strong>of</strong> wireless transmission with four tuned circuits was<br />

described in U.S. patent numbers 645,576 (March 20, 1900) <strong>and</strong> 649,621<br />

(May 15, 1900). The applications were filed on September 2, 1897.

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