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The key invention that made them possible was ball bearings. This is why the modern bicycle and the modern car were invented within a year or two of each other.
by Alex3917 4y ago
The key invention that made them possible was ball bearings. This is why the modern bicycle and the modern car were invented within a year or two of each other.
- alt227 4y ago...and roads, which were created for use by horses and carraiges.