Way back when..
A pair of local brothers, Daniel & George Van Brunt, built the first seeding machine back in 1860 and revolutionized the farming industry.
Then John Deere purchased the Van Brunt plant and tiny Horicon became the "grain dill capital" of the world.
Find the dates on the two cornerstones at the first location. (ABCD is the earlier date)
Cache location is:
March 30, 2003 Update: Changed from a virtual to a hidden cache. If you already found the virtual, please do not hunt this cache again. Thank you
~The Lil Otter
Note: Guess what they made in more recent times? Pickle is their local nic'name.