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=== Clear Speech Procedure ===
In 1971, the Public Safety Department of [[Lakewood, Colorado]], published a study comparing the APCO Ten-code with the proposed Clear Speech procedure. The study used standards for judgment of both communications procedures based on ''The Public Safety Communications Standard Operating Procedure Manual'', 1970 edition, published by APCO. Accordong to the report, the Clear Speech Procedure was to replace ten-codes in all Public Safety Department radio communication since January 28, 1972.<ref name=":0" />
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