The first entry is always the pin's source. Overall confidence is a weighted average of how firmly each reference supports the start and end times used above; a reference counts half as much for every 180 days older than the newest.
Multiple sources (Wikipedia[3], Curbside Classic[4]) state Caterpillar first unveiled a completed 797 at its Decatur, Illinois plant on 29 September 1998.
Covers Caterpillar’s mining-truck manufacturing including the 797B, the same real-world subject as this pin’s 797 unveiling.[1]
States Caterpillar unveiled the completed 797 at its Decatur assembly plant on 29 September 1998.[1]
Corroborates the 1998 unveiling and 1999 entry into service at Bingham Canyon mine.[1]
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