According to archaeologists, the wheel was invented around 4000 BCE probably independently and nearly concurrently in Mesopotamia (in present-day Iraq), the Northern Caucasus and Central Europe. Estimates on when this will likely have occurred range from 5500 to 3000 BCE with most consultants placing it closer to 4000 BCE. The oldest artifacts with drawings depicting wheeled carts date from about 3500 BCE; nevertheless, the wheel might have been in use for millennia before these drawings have been made.
- The ensuing network performance is measured by volume capability ratio, community average pace, aggregate journey distance and time.
- Consequently, the strain drop of the valve may have wider ranges and achieve a excessive value of strain variations.
- For medical functions of technology, see diagnosis; therapeutics; drug; medication, history of; pharmaceutical industry.
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