Number | Name | Date | Kind |
---|---|---|---|
172707 | Nishwitz | Apr 1887 | |
801961 | Balmer | Oct 1905 | |
1376910 | Wright | May 1921 | |
1377115 | Clayton | May 1921 | |
1630415 | Blume et al. | May 1927 | |
2582503 | Oehler | Jan 1952 | |
2689511 | Begeman et al. | Sep 1954 | |
3804179 | Johnson | Apr 1974 | |
4121669 | Sosalla | Oct 1978 | |
4250970 | Pfenninger | Feb 1981 | |
4425972 | Steinberg | Jan 1984 | |
4428437 | Steinberg | Jan 1984 | |
4452315 | Swanson | Jun 1984 | |
4466492 | Steinberg | Aug 1984 | |
4485878 | Uken | Dec 1984 | |
4591002 | Meinert | May 1986 | |
4622906 | Melgoza | Nov 1986 | |
5133414 | Youngkrantz | Jul 1992 |
Entry |
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"The Renaissance of Rotary Hoes", By: Charlene Finck, Farm Journal, May 1990. |
Yetter Tool Bar Rotary Hoe from pp. 6-7 of Yetter Mfg. Co. catalog (date unknown, admitted prior art). |
May-Wes Speedshields ad from "Successful Farming", Aug., 1990. |