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(TCޥޥ)Technical
(TO*ޥޥ)technical
(WDޥޥ)Working Dr
(USASIޥޥ)United Sta
(TSO*ޥޥ)technical
(PSTޥޥ)Pacific St
(MEL*ޥޥ)minimum eq
(mlޥޥ)(F) millil
(NASޥޥ)National A
(NECޥޥ)National E
(NFޥޥ)(F) Norme
(NSAIޥޥ)National S
(NVLAPޥޥ)National V
(OFSޥޥ)optical fr
(ANޥޥ)Air Force-
(ATޥޥ)atomic tim
(B.S.ޥޥ)Brown & Sh
(BSޥޥ)British St
(BSޥޥ)Bureau of
(BSGޥޥ)British St
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