It is even possible that the product was discovered independently at different times.

Immunization was discovered independently by several researchers in the early 1940s and 1950s.

It burst forth in early November 1572 and was independently discovered by many individuals.

This deletion syndrome was discovered independently in 2006 by three different research groups.

The process was independently discovered in 1851 by William Kelly.

However, in its modern, mathematical form, the system is thought have been discovered independently by at least three men:

Room temperature fusion has been discovered independently and simultaneously by two groups in Utah working within a few miles of each other.

The technique is very old and its origin uncertain, though it was probably discovered independently several times by different peoples.

It was discovered independently by Koch and Weeks in the 1880s.

The remains (bronze cannon) were independently discovered by two different diving groups in July 1971.