In the notification, Turkey indicated as follows:

"Those who fill out and send “Application Form for the Interested Party” (application form) to the competent authority within the period of 20 days after the promulgation of the related Communiqué are accepted as interested parties in the investigation. […] The interested parties are required to fill out the “Online Questionnaire for the Interested Party” (online questionnaire) by logging in to http://ithkorunma.ekonomi.gov.tr webpage with the username and password provided by the investigating authority, within the period of 30 days after the initiation of the investigation.

[…]

The address of the investigating authority for correspondence is:

Ministry of Economy
Directorate General for Imports, Department of Safeguards
Inonu Bul. No: 36 06510 Emek/Ankara/TURKEY
Tel:  +90 312 204 77 17
Fax: +90 312 212 86 33
E-mail: [email protected]"

Further information is available in G/SG/N/6/TUR/20.

What is a safeguard investigation?

A safeguard investigation seeks to determine whether increased imports of a product are causing, or is threatening to cause, serious injury to a domestic industry.

During a safeguard investigation, importers, exporters and other interested parties may present evidence and views and respond to the presentations of other parties.

A WTO member may take a safeguard action (i.e. restrict imports of a product temporarily) only if the increased imports of the product are found to be causing, or threatening to cause, serious injury.