The system had apparently undergone modifications since it was set up.

They existed from 1577 until 1789 and underwent several modifications during that time.

The church has undergone extensive modifications from its original design.

The structure has undergone relatively little modification since its construction.

In 1938, the alphabet underwent significant modification which brought it to its current form.

As mentioned above, Einstein's position underwent significant modifications over the course of the years.

The family was first proposed in 1926, and has undergone moderate modifications since then.

Old buildings from the early days include the foundations of the city church, a building which has undergone several modifications.

Because things did not work out according to plan, the original Baker strategy has already undergone modifications.

The device comes in five different sizes and has undergone modification over the years.