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这是保存在aprs.fi数据库的呼号和物件名称的可浏览索引，索引每1小时更新一次。

C31:
  C31AG C31AG-10 C31AG-11 C31AG-13 C31AG-15 C31AG-5 C31AG-7 C31AG-D
  C31AG-N C31AR-1 C31AR-10 C31AR-12 C31AR-6 C31AR-7 C31AR-9 C31BE-9
  C31BP-10 C31ER C31ER-1 C31ER-10 C31ER-12 C31FR C31FR-10 C31FR-13
  C31FR-2 C31FR-3 C31FR-7 C31FR-8 C31FR-D C31JB-1 C31KC C31PP-1
  C31PP-10 C31PP-2 C31PP-3 C31PP-4 C31PP-5 C31PP-7 C31PP-9 C31PP-Y
  C31US-1 C31VC C31VC-1 C31VC-10 C31VC-11 C31VC-12 C31VC-15 C31VC-3
  C31VC-4 C31VC-6 C31VC-7 C31VC-9 C31VC-D C31VC-N C31VC-Y C31VM B
  C31VM-1 C31VM-B C31VM-N C31VQ-1 C31VQ-12 C31VQ-9
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