A beaverslide, which is used for stacking large bales of hay. Invented in Montana, circa 1908.
<a rel="nofollow" class="external text" href="http://nrcs-photogallery-mt.smugmug.com/">USDA Natural Resources Conservation Service</a>
<a rel="nofollow" class="external text" href="http://nrcs-photogallery-mt.smugmug.com/MontanaPhotos/Harvest/20263240_xvcdLL#!i=1991108404&amp;k=xkPhbt9">USDA Natural Resources Conservation Service, Montana Harvest Photo Collection</a>