Pneumatic can opener.
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Previously:
https://www.homemadetools.net/forum/...2579#post96643
https://www.homemadetools.net/forum/...179#post115843
https://www.homemadetools.net/forum/...054#post137980
https://www.homemadetools.net/forum/...909#post124696
https://www.homemadetools.net/forum/...5062#post81114