14 C.F.R. § 21.161 Display.
Title 14 - Aeronautics and Space
The holder of a production certificate shall display it prominently in the main office of the factory in which the product concerned is manufactured.
Title 14: Aeronautics and Space
PART 21—CERTIFICATION PROCEDURES FOR PRODUCTS AND PARTS
Subpart G—Production Certificates
§ 21.161 Display.