The IPO model— rediscovered in an old straw baler

Last week I helped my partner to press straw with an old straw press from the 50s. The press is pulled over the field by the tractor. It swallows the straw and throws out a lightly pressed bale at the back, which is tied together with two sisal threads on the left and right. Now for the first time we had to rethread the thread. With the help of the drawings in the written instructions we quickly found…