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As part of the mission, MacLean took his first spacewalk and operated both Canadarms - one aboard the shuttle, the other aboard the space station.
Four more Canadarms were built and delivered to NASA for three shuttles - Discovery, Atlantis and Endeavor - and are still being used today.
During the four servicing missions Canadarm supported 18 spacewalks for a total of over 129 hours of extra vehicular activity.
In return, NASA contracted to buy at least three more Canadarms from the prime contractor, Spar Aerospace of Toronto.
Operating the Canadarm may mean moving it very accurately and slowly over a distance of millimetres or it may mean moving it precisely over several metres at a very high speed.
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