As I explained on STYLE-947 (and hinted at in STYLE-946) there are companies that own pressing plants where physical media are manufactured. We currently do not have a specific relationship for these companies.
STYLE-950 "Glass mastered by" Label-Release relationship
STYLE-945 "Pressed at" Place-Release Relationship
STYLE-946 Add Pressing Plant as a Place type
STYLE-947 "Pressed by" Label-Release relationship