Middle Ages
2 recorded milestones at this point in the record.
The Artuqid engineer described pumps, clocks and the crank-slider mechanism.
Why it mattered
The crank-connecting rod converts rotary to reciprocating motion in almost every engine since.
The yam network of remount stations carried messages thousands of kilometres.
Why it mattered
Made Eurasia briefly a single space for trade and information.
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Europe
Northern Europe
Europe
England
Italy
Persia