DGR Inc.

American company offering CD/DVD/Blu-Ray replication as well as glass mastering services. The manufacturing process is outsourced, working with several manufacturing partners across the USA. Usually they are credited in the matrix as DGR.
If the company is indicated with the URL branding on the release, please use www.dgrinc.com instead.

They usually attach sequencial job numbers (a 4-digit number found in the matrix next to their web address or "DGR") to their handled product which can be added to the LCCN via "Manufactured By" (don't use "Pressed By").
Example DFM CA / www.dgrinc.com - DGR 1414 Deathhammer 2 - 41684 (reference)
The job number to be added is "1414"
Please be careful not to list the number following the artist identifier in the matrix, as this refers to something else.