Framingham Mass FD - 483.5875 mobiles - ???

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https://wireless2.fcc.gov/UlsApp/UlsSearch/license.jsp?licKey=1222154&__newWindow=false - Framingham Mass FD has been licensed for mobiles on 483.5875 since 1990. Has anyone ever heard them use this freq? What is the channel name? What is the PL/DPL? Can the dispatcher talk on this channel?