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.
Menzi Muck[3] AG's own company history states the first walking excavator, the Menzi Muck 2500, was launched in 1966, but does not publish an exact day, so only the year is confirmed.
Corroborates 1966 as the year the first Menzi Muck[3] walking excavator was built.
Menzi Muck AG's own company page states the first walking excavator launched in 1966 and gives the Rüthi headquarters.
Something missing or wrong? Say it in your own words: a link that backs this pin up, a different start or end date and why, or a fact it lacks or gets wrong. The AI checks it against this pin's sources, searches for better ones, and adds any page that backs you up. The pin's own sources still count most.