ESTIMATEDDate confidence: ESTIMATEDA target, not a fixed dateHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all ESTIMATED pins65% CONFIDENCEOverall confidence: 65%How well the pin's source and references back up its dates.Weighted average of how firmly 3 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins from 50% to 74% confidence
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.Swiss inventor Ernst Menzi's company launched the Menzi Muck 2500 in 1966, the world's first all-terrain walking (spider) excavator, built to work steep Alpine slopes conventional machines could not reach.
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