I asked you a few days ago to identify a product made in Sioux Lookout. Thanks to Google, you guys had it solved within minutes of me posting the question: they are airplane skis. They kind of look more like airplane snowboards to me.
By skis I mean a modification to the landing gear to allow an airplane, specifically a Norseman, to land on snow. A little more about the company and a great summary of the history of Ontario bush flying here. I've never flown a skiplane, but my licence allows me to. for some reason the Transport Canada licensing system requires separate training for wheel landings and float landings, but a pilot trained on either wheels or floats can legally operate on skis.
The photos were taken at the Western Antique Aeroplane & Automobile Museum, behind the Hood River airport in Oregon. It's just across the Columbia River from The Dalles, Washington, where they will let you borrow a truck to drive into town.