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METAL LOCKS AND PADLOCKS BEARING AN INDICATOR; METAL LOCKS AND PADLOCKS THAT ARE EQUIPPED WITH INDICATORS AND CAN BE OPERATED BY KEYS AS WELL AS BY COMBINATION; METAL LOCKS AND PADLOCKS CAPABLE OF SIGNALING THEIR STATUS; METAL LOCKS AND PADLOCKS THAT INDICATE HOW THEY HAVE BEEN OPENED; METAL LOCKS AND PADLOCKS THAT INDICATE IF THEY HAVE BEEN OPENED BY KEYS OR BY A PARTICULAR TECHNIQUE; AND METAL LOCKS AND PADLOCKS THAT ARE OPERABLE BY KEYS PROVIDED TO THE TRANSPORTATION SAFETY ADMINISTRATION