// todo need optimize like in event.jsp. Add indexing or not indexing this page. Cylindrical slide rule (jan 1, 1891 – 14h 49min, jul 1, 2019 y) (Timeline)

Cylindrical slide rule (jan 1, 1891 – 14h 49min, jul 1, 2019 y)

Description:

Edwin Thacher introduced a cylindrical slide rule in the United States.

Added to timeline:

Counting/Caculating Inventions

ByEmily Stark

4 Nov 2019

Date:

jan 1, 1891

14h 49min, jul 1, 2019 y

~ 128 years

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