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| Number | Date | Country |
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| 3432902 | Mar 1986 | DE |
| 102010048751 | Oct 2010 | DE |
| 2222938 | Feb 2004 | RU |
| 1419732 | Aug 1988 | SU |
| Entry |
|---|
| Chapin 4700 HydroFeed Auto-Mix Fertilizer Injector, posted on chapinmfg.com, no posted date given, no production date given, [online], [site visited Aug. 5, 2018], Available from Internet, URL: https://chapinmfg.com/Product/slug/Chapin-4700-HydroFeed-16-Ounce-Fertilizer-Injector-System (Year: 2016). |