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• British fishing port registration for Carlisle
• cathode luminescence
• central locking (in motor advertisements)
• Chem. chain length
• Electronics Child-Langmuir
• civil law
• Civil Lord
• (Belgium ) Commander of the Order of Leopold
• common law
• Communication Lieutenant
• confidence limits
• craft loss
• critical list
• Med. cruciate ligament
• British vehicle registration for Norwich
• international vehicle registration for Sri Lanka (formerly Ceylon)