Before revision: While the original ABC was dismantled and discarded in the 1940s a tribute was made to the late inventors , a replica of the ABC was made in 1997 where it took a team of researchers and engineers four years and 350,000 to build.
After revision: While the original ABC was dismantled and discarded in the 1940s a tribute was made to the late inventors ;,, a replica of the ABC was made in 1997 where it took a team of researchers and engineers four years and 350,000 to build.