Digraph

Inventors
1889 Igor Sikorsky
Inventors
1889 Thomas Midgley Jr
Inventors
Fred Koch
InventorsPeople involved in politics and government in the United StatesPeople involved in the John Birch Society
James Watt
Inventors
Lewis Winkler
Inventors
Thomas Edison
Inventors
Wintergatan - Marble Machine (music instrument using 2000 marbles)https://www.youtube.com/watch?v=IvUU8joBb1Q
Inventors

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Inventors
Pre-historic, historic and present-day people