ระบบ U777D

https://www.scribd.com/document/838486955/U777D-%E0%B9%80%E0%B8%A7-%E0%B8%9A%E0%B8%95%E0%B8%A3%E0%B8%87%E0%B9%84%E0%B8%A1-%E0%B8%9C-%E0%B8%B2%E0%B8%99%E0%B9%80%E0%B8%AD%E0%B9%80%E0%B8%A2-%E0%B8%99%E0%B8%95-%E0%B8%84%E0%B8%A7%E0%B8%B2%E0%B8%A1%E0%B8%AA%E0%B8%B0%E0%B8%94%E0%B8%A7%E0%B8%81%E0%B8%AA%E0%B8%9A%E0%B8%B2%E0%B8%A2%E0%B9%83%E0%B8%99%E0%B8%81%E0%B8%B2%E0%B8%A3%E0%B9%80%E0%B8%94%E0%B8%B4%E0%B8%A1%E0%B8%9E%E0%B8%B1%E0%B8%99-193160

ระบบ U777D