Assertion: series tractor | /r/HasProperty | replaced by deere's iron horsesseries
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text: The 5020 was replaced by the very similar 6030 and continued in production with New Generation styling until 1977 when the 30 Series tractors were replaced by Deere's 'Iron Horses' series that included the 90-hp 4040, 110-hp 4240, 130-hp 4440, 150-HP 4640, and 180-hp 4840.