An official website of the United States government
Here is how you know
The .gov means it's official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information,
make sure you're on a federal government site.
The site is secure.
https:// ensures that you are connecting to the official website and that any
information you provide is encrypted and transmitted securely.
Arthur S. Herman
Output per employee hour increased an average of only 1.2 percent annually in the oilfield machinery industry between 1967 and 1983, with output going through several boom and bust cycles.