https://view.officeapps.live.com/op/view.aspx?src=https%3A%2F%2Fwww.lowellma.gov%2FDocumentCenter%2FView%2F7866%2FCopy-of-LOWELL-KELTRON-RADIO-May-2019%3FbidId%3D&wdOrigin=BROWSELINK
spreadsheet from 2019
seems to be radio boxes at fire stations and city buildings - maybe is
public address system in fire stations also
if link does not work - go to city website and search for keltron -
there is a 2018 keltron document also
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