Jim,
Deere built and/or sold several subsoilers. In 1937 they came out with the No. 15, built until about 1961. It has two steel wheels, a depth lever, a curved beam with a point, and a clutch trip similar to that on a plow. In 1941 the clutch went to the enclosed style. A "mole" (about 6" dia cast, tapered piece) attachment was available to improve drainage in subsoiled fields.In 1946 they introduced their S-16 subsoiler, a unit with a shank but no wheels. It had a rolling coulter like a plow, and could be tripped so the shank and point came out of the ground. They also sold integral subsoilers to fit a tool bar. The TP-16 began in 1953 and fit on the 3 point hitch on a Model 40. Deere also sold the Killefer "panbreaker" line of heavy-duty subsoilers, some of which had very large rear wheels (64" dia by 8" width and could subsoil to 36" deep), and were designed to be pulled by large crawler tractors. There was one of these at the Portland, IN show a few years ago. I have two No. 15's and a small (#15) Killefer with a 20" subsoiler bar, and they work great at plow days. The 15's can be set to load anything from an unstyled B to a G, and leave the ground surface relatively untouched. The Killefer can be set to bog down most any two cylinder that shows up.
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