English to Portuguese Bus/Financial Law (general) Indentures

Note Registrar:

The Issuer shall cause to be maintained by a note registrar (the “Note Registrar”) a register (the “Note Register”) which, subject to such reasonable regulations as the Issuer may prescribe, shall provide for the registration of Notes and for the registration of transfers and exchanges of Notes. The Trustee is hereby appointed the initial Note Registrar for the purpose of registering Notes and transfers and exchanges of Notes as herein provided. Upon any resignation or removal of the Note Registrar, the Issuer shall promptly appoint a successor, or in the absence of such appointment, assume the duties of such Note Registrar. The Issuer may appoint one or more co-registrars.

Qual seria o equivalente jurídico definido? Agente Registrador?