A similar mechanism appears to have been invented independently, much later on.

Around 1927 or 1928 he independently invented a writing system for the Chukchi language.

Thus, the changi could have been invented independently in different nations.

It is the case that the same stuff is independently invented all the time.

Traps are culturally almost universal and seem to have been independently invented many times.

The tundra style tire has been independently invented at different times and places.

Thomas Jefferson independently invented a similar device in 1790, which had 36 disks.

Some twenty years later it was independently invented and patented by another inventor.

As such, many of the methods have been independently invented several times, often with subtle variations, leading to a confusing literature.

Writing was invented independently a number of times.