Patent searches are among the things I don�t miss at all now that I am retired. However, a quick patent search showed several patents with applications in the early 1920�s with issue dates in the mid 20�s. These are all what I would consider to be in the �improvement� class of patents, so the general concept had to be around prior to 1920, so 100 year old technology seems to be about right.
US 1452286; Power-lift drill; Publication date Apr 17, 1923; Filing date Jul 15, 1920
US 1569878; Power lift for mower bars; Publication date Jan 19, 1926; Filing date Sep 19, 1921
US 1675433; Power lift plow; Publication date Jul 3, 1928; Filing date Oct 1, 1923
If you go into Google Patent Search with these patent numbers you see the drawings of the inventions that are quite interesting. I did a very quick search on the a couple names of the inventors in these patents to see if I could find prior art. I didn�t, but one of them at least had inventions as early as 1910. RND
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Today's Featured Article - Harvestin Corn in Southern Wisconsin: The Early Years - by Pat Browning. In this area of Wisconsin, most crops are raised to support livestock production or dairy herds in various forms. Corn products were harvested for grain, and for ensilage (we always just called it 'silage'). Silo Filling Time On dairy farms back in the 30's and into the first half of the 40's, making of corn silage was done with horses pulling a corn binder producing tied bundles of fresh, sweet-smelling corn plants, nice green leaves with ear; the
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