Although belt-powered balers appeared in the early 1900s, all were stationary styles. Pick-up balers became a reality in 1940. The advent of these machines revolutionized hay harvesting, making it no longer necessary to handle loose hay. An example of these pick-up balers is this post World War II International Harvester. This baler was tractor-pulled with an automatic tie (twine, not wire). With a capacity of up to six bales per minute, this machine could bale up to ten tons of hay per hour.