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John Donald ZACHARY, M.D. (Zychowski)
 

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The following individual is flagged as living and could not be added because you are not logged in with proper permissions: John Donald ZACHARY, M.D. (Zychowski) (I6805)

1924
1924
1924
1925
1925
1925


 
 




   Year  Event(s)
1924 
  • Notebooks with spiral bindings invented.
  • The dynamic loudspeaker invented by Rice and Kellogg.
1925 
  • The mechanical television a precursor to the modern television, invented by John Logie Baird.

  
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