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Duplex ruler (14h 39min, nov 21, 2018 y – 14h 49min, jul 1, 2019 y)

Description:

In 1891 The duplex rule was invented by William Cox

Added to timeline:

Counting/Caculating Inventions

4 Nov 2019

0

0

373

Date:

14h 39min, nov 21, 2018 y

14h 49min, jul 1, 2019 y

~ 7 months

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