Such tracking was famously used in the Alger Hiss case: https://en.wikipedia.org/wiki/Alger_Hiss#Fake_typewriter_hypothesis https://en.wikipedia.org/wiki/Alger

Such tracking was famously used in the Alger Hiss case: https://en.wikipedia.org/wiki/Alger_Hiss#Fake_typewriter_hypothesis https://en.wikipedia.org/wiki/Alger_Hiss#Fake_typewriter_hyp...