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materials-metals

InventTable — NUMBERS ERA — Materials, metals

InventionDescriptionYearInventorCountry
Bessimer process steel production 1040 AD China
Coil spring timekeeping 1420 AD Germany

Back to InventTable Era: NUMBERS ERA Classification: Materials, metals

Leo Dean Jansen

Leo Dean Jansen, MD is a retired orthopedic surgeon with a special interest in the history of technology.  This web page is the culmination of  his efforts to define and organize the history of technology as seen through 2000 inventions.  TECHNOLOGY:  TABLE, TRUTHS, TIMELINE, TOP 100 represents the 4 parts of this project.

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