ระบบ U777D

https://www.scribd.com/document/838432411/%E0%B9%80%E0%B8%97%E0%B8%84%E0%B8%99%E0%B8%B4%E0%B8%84%E0%B8%81%E0%B8%B2%E0%B8%A3%E0%B9%80%E0%B8%A5-%E0%B8%99%E0%B8%9A%E0%B8%B2%E0%B8%84%E0%B8%B2%E0%B8%A3-%E0%B8%B2-%E0%B9%80%E0%B8%84%E0%B8%A5-%E0%B8%94%E0%B8%A5%E0%B8%B1%E0%B8%9A%E0%B8%88%E0%B8%B2%E0%B8%81-U777D-%E0%B8%97%E0%B8%B5-%E0%B8%84%E0%B8%B8%E0%B8%93%E0%B9%84%E0%B8%A1-%E0%B8%84%E0%B8%A7%E0%B8%A3%E0%B8%9E%E0%B8%A5%E0%B8%B2%E0%B8%94-222632

ระบบ U777D