Clerk (GEOI)
Cadillac & Lake City Railway Co. - AAR code
Chileka - Malawi - Seismograph station code, US Geological Survey (SEIS)
Clark Aviation Corp. - ICAO designator (FAAC)
Clark Boat Co. - NCIC boat manufacturer code (NCIC)
Clark Consolidated Industries, Inc. - AMEX symbol (COMM)
Clerk (AFM)
Clerke Technicorp - NCIC firearms make code (NCIC)
Clinton, OK - Location identifier - FAA (FAAL)
Clock (AAG)
Colchis Resources Ltd. - Vancouver Stock Exchange symbol
Contact-Lens-Induced Keratoconjunctivitis - Ophthalmology
Craton, Lodge and Knight - British
Hunter-Killer Ship - Navy symbol - Obsolete
Idu - Language code (ETLW)
Kaiser Foundation Hospital, Los Angeles, CA - Library symbol - Library of Congress (LCLS)
Port Gardner Sailboats, Conway, WA - Manufacturer code for watercraft hull identification number (USCG)
Caulk (MIST)
Clerk (GEAB)
Clock (ELAL)
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