File:Cambell Filter.png
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- 2009-07-26 15:20 Spinningspark 724×178× (8307 bytes) {{Information |Description=Campbell's original sketch of his wave filter. Some annotation removed for clarity. |Source=, ''Electric wave-filter'', US patent 1 227 113 |Date=filed 15 July 1915, issued 22 May 1917 |Author=George A, Campbell (edited by ~~~)
