Early stair-climbing chair.
https://diqn32j8nouaz.cloudfront.net...bing_chair.jpg
Previously:
https://www.homemadetools.net/forum/...537#post155088
https://www.homemadetools.net/forum/...3242#post77706
https://www.homemadetools.net/forum/...693#post133021
https://www.homemadetools.net/forum/...729#post159630
https://www.homemadetools.net/forum/...791#post159860
