John Larson invents the modern polygraph, Verisoph

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Title Summary

Start date (EDTF) 1921 End date (EDTF, empty for a point event)

1914 · 1914-07-28 · -0489 (490 BCE) · 1930~ (circa) · 19XX (century) · 197X (decade)

Location Importance (1 minor to 5 pivotal)