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 - The 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
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