Ground opener tool

Machines not elsewhere specified – Agricultural or construction machinery – Element or attachment

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D03740188

REFERENCES:
patent: 104754 (1870-06-01), Miner
patent: 139750 (1873-06-01), Zocher
patent: 147633 (1874-02-01), Haiman
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patent: D274187 (1984-06-01), Krammer
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patent: 589025 (1897-08-01), Purnell
patent: 1639593 (1927-08-01), Dean
patent: 1648843 (1927-11-01), Francis
patent: 4583599 (1986-04-01), Anderson

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