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Newer page: version 18 Last edited on June 7, 2019 8:29 pm. by
Older page: version 17 Last edited on May 6, 2013 9:51 pm. by
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 Year Number Inventor(s) Title/Description 
 1921 1,435,520 Hammond Stereoscopic Motion Picture (3d movies!) 
-1929 1,719,805 Hammond Best Available Corn (Search Google Patents for more info) . 
+1929 1,719,805 Hammond Alternating Current Clock . 
 1934 1,956,350 Hammond Electrical Musical Instrument (original organ patent). 
 1936 2,036,892***Smiley Art of Producing Musical Sounds Electronically (RE20825). 
 1936 2,083,246***Smiley Electronic Musical Instrument(RE20831). 
 1937 2,099,204 Hammond Multiple Key Switch (keyboard switch contacts). 

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