Office Management Regulations B.E. 2526 and Amendments No. 4 B.E. 2564 (EP.1)
EP. 1/3: Book Type Definitions
EP. 2/3: Book Receiving & Sending / Book Storage & Destruction
EP. 3/3: Standard Seals, Forms & Envelopes / Sections 5, 6, 7 / Electronic Document Management System and Appendices
**Edited: Internal documents use the salutation appropriate to the recipient's status (it does not specify that they must begin with "เรียน" only).
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