0001277277-04-000474 Sample Contracts

EXHIBIT 4.1 WASHINGTON MUTUAL MORTGAGE SECURITIES CORP., as Depositor and Master Servicer

Pooling and Servicing Agreement • June 9th, 2004 • WaMu Mortgage Pass-Through Certificates Series 2004-Ar4 • Asset-backed securities • Delaware

• Contract Type
  Pooling and Servicing Agreement
• Filed
  June 9th, 2004
• Company
  WaMu Mortgage Pass-Through Certificates Series 2004-Ar4
• Industry
  Asset-backed securities
• Jurisdiction
  Delaware