: "21:04 Min" likely represents a duration or a precise time of measurement recorded during a field survey.
However, based on the components of the string, here are the most likely contexts for such a feature identifier: 1. Land Surveying (ALTA/NSPS Standards) NSPS-94103:21:04 Min
Though largely replaced, NSPS was a Department of Defense HR system. : "21:04 Min" likely represents a duration or
: This could be a NIP-31999 event ID or a chunked payload reference with a timestamp. NSPS-94103:21:04 Min
The acronym is also used by the EPA for New Source Performance Standards .