Within this article: Details on U.S. natural gas pipeline projects, including those from major companies such as Kinder Morgan Incorporated ( KMI ), TransCanada Corporation ( TRP ), Spectra Energy Corporation ( SE ) and Williams Companies ( WMB ).
Refer to the input text as context and select the correct relationship between 'Williams Companies' and 'natural gas' from the available options.
Options: chairperson, original broadcaster, manufacturer, product/material produced