Elmer Ambrose Sperry of Cleveland, Ohio invented disc brakes in 1898. In what year did American manufacturers adopt them? (Have no clue? No worries, we’ll post the answer later tonight.)

6 votes
1902
 
0% / 0 votes
1946
 
33% / 2 votes
1959
 
17% / 1 vote
1973
 
50% / 3 votes


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