Please excuse me for writing in English, my Deutsch is very poor.
Australia has at least one Müller chairlift still operating. It is the Mount Perisher double chair at Perisher ski resort. It was built in 1961, is 1075 metres long with a rise of 275 metres. It is the oldest chairlift still operating in Australia.
Early chairlifts in this country were built from wooden poles, but by the late 1950's, we were beginning to buy chairlifts from European and North American suppliers. Müller was not a success in Australia as they had a tendency to ice up and de rail. The first Müller chairlift built in Australia was the Crackenback chair at Thredbo. It was built in 1958 and extended in 1962. It was 1835 metres long with a rise of 560 metres. Operation was so unsatisfactory that it was partly rebuilt with Riblet towers on the upper section above the tree line.
Doppelmayr built their first chairlift anywhere in the world at Mt Buller in 1964. Most chairlifts and gondolas in Australia since then have been Dopplelmayr or Poma.
The last Müller chairlift built in Australia was the 5,000 metre long lift linking the small snowbound resort of Charlote Pass to the main highway. It only operated in 1964 and 1965. It was closed due to regularbreakdowns and it's inablilty to cope with strong winds.
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Finally, if anyone is interested, here is a complete list of all 400 ski lifts built in Australia with years of operation, manufacturer, length, etc.
http://wikiski.com/wiki/index.php/Australian_ski_tow_directory